Unitree Robotics
Unitree A2 Quadruped Robot
The Unitree A2 (Stellar Explorer) is the industrial-grade middle of the Unitree quadruped lineup, and its spec sheet earns the word industrial: IP56 ingress protection, a -20°C to 55°C (-4°F to 131°F) operating range, more than 5 hours and 20 km (12.4 mi) of unloaded endurance on hot-swappable dual batteries, and a 100 kg (220 lb) standing load. Where a Go2 is a capable dry-conditions platform, the A2 is the working patrol-and-inspection robot that runs real routes in real weather.
Key Highlights
- IP56-rated (dust-protected, high-pressure water jets). On the A2 Pro, Unitree rates core components to IP67
- Endurance: over 5 h and about 20 km (12.4 mi) unloaded. Over 3 h and about 12.5 km (7.8 mi) carrying 25 kg (55 lb)
- Dual-slot hot-swappable batteries: 9,000 mAh (453.6 Wh) each, 18,000 mAh (907.2 Wh) combined
- Industrial-grade LiDAR plus HD camera and front light. The A2 Pro adds a second LiDAR, front and rear
- Intel Core i7 development computer standard, with secondary development supported
- Handles 45° slopes and steps up to 30 cm (11.8 in) at speeds up to 3.7 m/s (8.3 mph)
Unitree A2 Specs
| Spec | Value |
|---|---|
| Models | A2 Standard, A2 Pro, A2-W and A2-W Pro (A2-W replaces the feet with a wheel-leg set) |
| Size (standing) | 820 x 440 x 570 mm (32.3 x 17.3 x 22.4 in) |
| Weight | About 42 kg (93 lb) with batteries, about 35 kg (77 lb) without. 12 joint motors, about 180 N·m (133 lb-ft) peak torque |
| Speed | 0 to 3.7 m/s (0 to 8.3 mph), with a ceiling of roughly 5 m/s (11.2 mph) |
| Load | About 25 kg (55 lb) continuous walking, roughly 35 kg (77 lb) in ideal conditions, about 100 kg (220 lb) standing |
| Terrain | Slopes about 45°, steps to 30 cm (11.8 in), max climb height about 0.5 to 1 m (1.6 to 3.3 ft) |
| Batteries | Dual hot-swap 9,000 mAh (453.6 Wh) packs, 18,000 mAh (907.2 Wh) combined, dual-slot parallel design |
| Endurance | Over 5 h and about 20 km (12.4 mi) unloaded. Over 3 h and about 12.5 km (7.8 mi) carrying 25 kg (55 lb) |
| Perception | Industrial-grade LiDAR x1 plus HD camera and front light on the A2. A2 Pro carries LiDAR x2, front and rear, and adds GPS, 4G and the wireless vector follow module |
| Compute | 8-core platform CPU plus an Intel Core i7 for user development. High-computing expansion dock optional |
| Interfaces | RS485 x2, CAN x2, Gigabit Ethernet x2, USB 3.0 Type-C x4, 12 V / 24 V / battery power out |
| Environment | -20°C to 55°C (-4°F to 131°F). IP56. A2 Pro core components rated IP67 |
| Warranty | 12 months manufacturer |
Specifications per the Unitree A2 User Manual V1.6 and unitree.com. The LiDAR is a Class 1 laser product (EN 50689:2021). The A2 is not a toy and is not intended for anyone under 18.
Built For
- Industrial patrol and inspection routes in real weather
- Public safety reconnaissance with heavier payloads
- Energy, utility, and infrastructure site monitoring
Good to Know
Built for professional deployment, not consumer use. The A2 is IP56-rated (dust-protected and sealed against high-pressure water jets) and carries a -20°C to 55°C (-4°F to 131°F) operating range, running over 5 hours and roughly 20 km (12.4 mi) on dual hot-swap batteries. It is weatherized for outdoor routes but it is not rated for submersion.
Quotes and Enterprise Purchasing
A2 deployments are typically quoted with accessories and payloads matched to the site. Request a formal quote from this page. Purchase orders supported for agencies, enterprises, and universities.
Warranty and U.S. Support
Sourced through Unitree's authorized U.S. distribution and backed by U.S.-based authorized warranty and repair service, with pre-sale and post-sale support from Global Drone HQ. Unitree publishes a 12 month warranty on the A2.
Explore the Unitree Lineup
Sizing the right platform for your site? Compare across the full Unitree collection. The Go2 Edu is the research platform on the lighter 15 kg (33 lb) chassis, and the Go2 Pro is the entry point. Both are dry-conditions machines with no ingress rating, so if the route involves rain, dust or cold, the A2 is the correct machine.
Verified US equipment authorization, FCC ID 2A5PE-YUSHU011
Sourced through Toborlife, Unitree's authorized US distributor and warranty center
Freight quoted to your destination
Purchase orders and tax-exempt purchasing welcome
Weatherized build
Unloaded endurance
x1 on A2, x2 on A2 Pro
Max speed
Walking payload
Pairs well with
Questions about configuration, lead time or deployment? We reply within one business day.
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Shipping and Delivery
Robots ship freight and insured to your dock or venue. Freight is quoted to your destination address and appears as a line item on your written quote. Lead time is confirmed in writing before you commit to a delivery date.
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Support
You deal with Global Drone HQ directly, before and after the sale. We help you pick the right configuration, handle delivery, first-line troubleshooting and setup, and we coordinate anything that needs the service center rather than handing you an address overseas.
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Warranty and Service
Toborlife is an authorized Unitree warranty and repair center in Mountain View, California, and handles complete-machine warranty service, repair or replacement of core components and factory-level diagnostics. Global Drone HQ is your first line for setup, routine troubleshooting and support. Units are sourced through Toborlife, Unitree's authorized US distributor. Unitree publishes a 12 month warranty on the A2.
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Contact Us
Email daniel@globaldronehq.com or call (858) 906-5185. Purchase orders and tax-exempt purchasing are welcome for schools, universities and public agencies.
An industrial quadruped that actually goes outside.
IP56, and it runs from -20°C to 55°C (-4°F to 131°F).
Over 5 hours and about 20 km (12.4 mi) on one pair of batteries.
Quarry walls, scree and stairs.
Twelve joint motors on industrial crossed roller bearings put about 180 N·m (133 lb-ft) of peak torque into every hip, thigh and knee. The A2 walks slopes of about 45°, steps up to 30 cm (11.8 in) and climbs obstacles of roughly 0.5 to 1 m (1.6 to 3.3 ft), at 0 to 3.7 m/s (0 to 8.3 mph) with a ceiling near 5 m/s (11.2 mph).
It maps the ground while it is moving.
The A2 ships with an industrial-grade LiDAR, an HD camera and a front light, so it reads terrain in the dark as well as in daylight. The A2 Pro adds a second LiDAR front and rear for coverage without a blind spot, and expands to GPS, 4G and the wireless vector follow module that the standard A2 treats as options.
Built for routes, not for demos.
About 42 kg (93 lb) with batteries on twelve joint motors, IP56 rated against dust and high-pressure water jets, rated from -20°C to 55°C (-4°F to 131°F), and carrying about 25 kg (55 lb) while it walks. This is the Unitree platform built for patrol, inspection and rescue work outdoors.
25 kg (55 lb) walking. 100 kg (220 lb) standing.
Continuous walking load is about 25 kg (55 lb), and Unitree notes it can reach roughly 35 kg (77 lb) in ideal conditions. Maximum static standing load is about 100 kg (220 lb). Loaded to 25 kg (55 lb) the A2 still walks more than 3 hours and about 12.5 km (7.8 mi), so a sensor package or a rescue load does not end the mission early.
Over 5 hours. About 20 km (12.4 mi).
Two 9,000 mAh (453.6 Wh) batteries run in parallel for 18,000 mAh (907.2 Wh) total, and they are hot-swappable, so you change one pack at a time without powering the robot down. Unloaded that is more than 5 hours of continuous walking and roughly 20 km (12.4 mi) of ground. Read those numbers as walking, not as standing idle.
IP56 Weatherized • 25 kg (55 lb) Walking Load • Over 5 h / 20 km (12.4 mi) • FCC ID 2A5PE-YUSHU011 • Quotes & POs Welcome
Legs, or wheel legs.
The A2-W swaps the feet for a wheel-leg set on the same chassis, which is faster and smoother on roads, ramps and hard floors while keeping the legged gait for everything else. Unitree does not publish separate speed, payload or endurance figures for the wheel-leg configuration, so treat the A2 numbers as the baseline and talk to us before you plan a route around them.
Dig Deeper
Perception and Compute
- Industrial-grade LiDAR and an HD camera as standard on the A2. The A2 Pro carries two LiDARs, front and rear.
- Front light, speaker and a microphone array, so the robot can light its own path and carry voice intercom.
- 8-core platform CPU plus an Intel Core i7 reserved for your own development. A high-computing expansion dock is optional.
- Wi-Fi 6 and Bluetooth 5.2 standard. GPS, 4G and the wireless vector follow module are optional on the A2 and expanded on the A2 Pro.
- Secondary development supported, with continuous OTA upgrades from Unitree.
Movement, Payload and Terrain
- 12 degrees of freedom on low-inertia inner-rotor motors and industrial crossed roller bearings, about 180 N·m (133 lb-ft) peak joint torque.
- 0 to 3.7 m/s (0 to 8.3 mph), with a ceiling of roughly 5 m/s (11.2 mph).
- About 25 kg (55 lb) continuous walking load, up to roughly 35 kg (77 lb) in ideal conditions, and about 100 kg (220 lb) standing.
- Slopes about 45°, steps to 30 cm (11.8 in), climb height about 0.5 to 1 m (1.6 to 3.3 ft).
- 820 x 440 x 570 mm (32.3 x 17.3 x 22.4 in) standing, about 42 kg (93 lb) with batteries and 35 kg (77 lb) without.
Power, Protection and Honest Limits
- Dual 9,000 mAh (453.6 Wh) hot-swap batteries, 18,000 mAh (907.2 Wh) combined, on a dual-slot parallel design.
- Over 5 hours and about 20 km (12.4 mi) unloaded, over 3 hours and about 12.5 km (7.8 mi) carrying 25 kg (55 lb).
- IP56 against dust and high-pressure water jets. On the A2 Pro, Unitree rates the core components to IP67. Neither version is rated for submersion.
- -20°C to 55°C (-4°F to 131°F) operating range, and 50.4 V supply with local air cooling.
- Not a toy and not for anyone under 18. The LiDAR is a Class 1 laser product under EN 50689:2021. Unitree publishes a 12 month warranty.
Compare the Unitree Quadrupeds We Can Ship
The A2 is the only Unitree quadruped in our current US line-up that is weather rated and built to carry real load. The Go2 Edu and Go2 Pro sit on the same 15 kg (33 lb) chassis and are dry-conditions machines. The Go2-W, As2 and B2 are not sellable in the US right now, so they are not shown.
Weight
About 42 kg (93 lb) with batteries
Weight
About 15 kg (33 lb)
Weight
About 15 kg (33 lb)
Top Speed
0 to 3.7 m/s (8.3 mph), up to about 5 m/s (11.2 mph)
Top Speed
0 to 3.7 m/s (8.3 mph), max about 5 m/s (11.2 mph)
Top Speed
0 to 3.5 m/s (7.8 mph)
Rated Payload
About 25 kg (55 lb) walking, about 100 kg (220 lb) standing
Rated Payload
About 8 kg (18 lb), max about 12 kg (26 lb)
Rated Payload
About 8 kg (18 lb), max about 10 kg (22 lb)
Protection
IP56, A2 Pro core components rated IP67
Protection
Not rated, dry conditions only
Protection
Not rated, dry conditions only
Endurance
Over 5 h and about 20 km (12.4 mi) unloaded, 18,000 mAh
Endurance
About 2 to 4 h, 15,000 mAh
Endurance
About 1 to 2 h, 8,000 mAh
Locomotion
Legged, wheel-leg optional as the A2-W
Locomotion
Legged
Locomotion
Legged
Operating Temp
-20°C to 55°C (-4°F to 131°F)
Operating Temp
5°C to 35°C (41°F to 95°F)
Operating Temp
5°C to 35°C (41°F to 95°F)
Best For
Outdoor industrial patrol, inspection and rescue in weather
Best For
Research, robotics labs and full SDK development
Best For
Owners, classrooms, events and content
Price
From $31,900
Price
From $11,190
Price
$3,790
FAQs
Is the Unitree A2 authorized for use in the US?
Yes. The A2 family is covered by Unitree's US equipment authorization under grantee YuShu Technology Co., Ltd., FCC ID 2A5PE-YUSHU011, which you can verify yourself at apps.fcc.gov/oetcf/eas. FCC equipment authorization is separate from NDAA procurement eligibility, so if you are buying under a federal procurement rule, check that with us first rather than assuming the two go together.
How long does it run on a charge?
More than 5 hours of continuous walking and roughly 20 km (12.4 mi) unloaded, and more than 3 hours and about 12.5 km (7.8 mi) carrying 25 kg (55 lb). Two 9,000 mAh (453.6 Wh) packs run in parallel for 18,000 mAh (907.2 Wh), and because they are hot-swappable you can change one at a time and keep the mission going.
How is the A2 different from a Go2?
Weather rating and load. The A2 is IP56, rated -20°C to 55°C (-4°F to 131°F) and carries about 25 kg (55 lb) while walking on a 42 kg (93 lb) frame. A Go2 is about 15 kg (33 lb), carries roughly 8 kg (18 lb), has no ingress rating and is rated 5°C to 35°C (41°F to 95°F). If the route involves rain, dust, cold or a real payload, the Go2 is the wrong machine and we will say so.
What is the difference between the A2, the A2 Pro and the A2-W?
The A2 Pro adds a second LiDAR for front and rear coverage, expands GPS, 4G and the wireless vector follow module from optional to included, offers a high-computing expansion dock and rates its core components to IP67. The A2-W replaces the feet with a wheel-leg set on the same chassis. Unitree does not publish separate performance figures for the wheel-leg version.
How much can it carry, and can I mount my own payload?
About 25 kg (55 lb) continuously while walking, roughly 35 kg (77 lb) in ideal conditions, and about 100 kg (220 lb) standing still. Mounting is through the snap buckle on the back and the external interfaces: RS485 x2, CAN x2, Gigabit Ethernet x2, four USB 3.0 Type-C ports and 12 V, 24 V or raw battery power out. Secondary development is supported on the Intel Core i7 that is reserved for user code.
Do you accept purchase orders?
Yes. We work with public agencies, utilities, universities and enterprise buyers and accept purchase orders and tax-exempt purchasing. A2 deployments are usually quoted with the payloads and accessories the site needs, so tell us what your procurement office requires and we will format the quote to match.