Unitree A2-W Review: Specs and Uses of the Industrial Wheeled Quadruped Robot

The Unitree A2-W is the wheeled version of the A2 industrial quadruped. Unitree lists both versions as "Contact Sales". This review covers its specifications, versions and uses.

Quick Verdict

The A2-W puts 190 mm wheels on the A2. It weighs about 52 kg, moves at up to about 6 m/s and covers about 35 km in more than 3.5 hours without load, or about 15 km carrying 25 kg. Dual batteries are hot-swappable, so a pack can be changed without shutting down. Joints of about 180 N·m let it climb 30 cm stairs and obstacles of 0.5 to 1 m. The base version is IP56 with one LiDAR; the PRO has two LiDARs and core components to IP67. Compared with the legged A2 it is faster and ranges further, with shorter endurance in hours.

Unitree A2-W at a Glance

• Weight: about 52 kg with battery

• Speed: up to about 6 m/s

• Walking load: about 25 kg

• Endurance: over 3.5 hours without load

• Protection: IP56

• Price: on request

Unitree A2-W Technical Specifications

The table below lists the manufacturer's specifications.

Specification	Unitree A2-W
Manufacturer	Unitree Robotics
Versions	A2-W; A2-W PRO
Size, standing	900 x 440 x 625 mm
Weight	About 45 kg without battery; about 52 kg with battery
Degrees of freedom	16
Max joint torque	About 180 N·m
Tyres	190 mm diameter, 51 mm wide
Speed	0 to 3 m/s; up to about 6 m/s
Continuous walking load	About 25 kg
Max standing load	About 100 kg
Battery	Single 9000 mAh (453.6 Wh); dual 18000 mAh (907.2 Wh); hot-swappable
Endurance without load	Over 3.5 h, about 35 km
Endurance with 25 kg	Over 1.5 h, about 15 km
Slope	About 45 degrees
Stairs	30 cm step height
Max climb height	About 0.5 to 1 m
Operating temperature	-20 to 55 °C
Protection	A2-W: IP56; A2-W PRO: IP56 to IP67
Sensors	A2-W: 1 LiDAR and 1 HD camera; PRO: 2 LiDARs and 1 HD camera
Warranty	12 months

Design and Build Quality

The robot uses the A2 body with a wheel motor on each leg, for 16 degrees of freedom. Two battery slots allow exchange during operation.

Programming and Software

Computing

An 8-core CPU runs the platform and an Intel Core i7 is provided for user development.

Interfaces

RS485, CAN, Gigabit Ethernet and USB 3.0 ports, with 12 V, 24 V and battery outputs.

Development

Secondary development and over-the-air upgrades are supported.

Unitree A2-W Applications and Use Cases

Large-Site Inspection

About 35 km of range on wheels.

Payload Transport

25 kg while moving.

Outdoor Operation

IP56 and -20 to 55 °C.

Unitree A2-W Price and Value

Unitree lists both A2-W versions as "Contact Sales" and does not publish a price.

For the company behind the product, read the Unitree Robotics Company Profile: History, Products, Stock Listing and Controversies.

Pros and Cons

Pros

• About 6 m/s and 35 km

• Hot-swappable dual batteries

• 180 N·m joints

• Rich interfaces

• PRO version to IP67 on core components

Cons

• Shorter endurance in hours than the legged A2

• Second LiDAR only on the PRO

• No published price

Who Should Buy the Unitree A2-W?

It fits inspection and logistics users on large sites who need speed and range with the ability to climb.

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Unitree A2-W FAQ

How much does the Unitree A2-W cost?

Unitree does not publish a price; both versions are listed as "Contact Sales".

How fast is the Unitree A2-W?

Up to about 6 m/s.

How much does the Unitree A2-W weigh?

About 52 kg with battery.

How much can the Unitree A2-W carry?

About 25 kg while moving, and about 100 kg standing.

How far can the Unitree A2-W travel?

About 35 km in over 3.5 hours without load.

Can the batteries of the Unitree A2-W be swapped while running?

Yes. The dual batteries are hot-swappable.

Is the Unitree A2-W waterproof?

The A2-W is IP56; the PRO has core components to IP67.

Can the Unitree A2-W climb stairs?

Yes, with steps up to 30 cm.

Specifications are based on manufacturer information and may change.