The Unitree A2 is an industrial-grade quadruped robot built for AI research, robotics development, industrial inspection, and rugged mobile robotics applications. Positioned as a medium-size legged platform in Unitree's industrial robot lineup, it combines strong payload capability, long walking endurance, hot-swappable dual batteries, and open secondary development support for teams that need a capable hardware platform beyond desktop robotics. According to the official Unitree A2 product page, the A2 weighs about 42 kg with batteries, supports a 12-DOF legged structure, delivers about 180 N.m maximum joint torque, and can continuously walk for more than 5 hours unloaded or more than 3 hours with a 25 kg load. For researchers and integrators, the standard onboard compute configuration includes an 8-core high-performance platform CPU plus an Intel Core i7 for user development. Compared with smaller educational quadrupeds, Unitree A2 is better suited for full-scale field experiments, payload transport tests, perception research, inspection workflows, and AI-controlled locomotion in complex environments. It is designed as a premium mobile hardware platform that can be extended through official development resources such as the Unitree SDK2 repository. Features Industrial quadruped platform - Unitree A2 is designed as a medium-size legged robot for industrial inspection, emergency-response research, logistics experiments, and advanced robotics development. Long walking endurance - Official A2 data lists more than 5 hours of continuous unloaded walking, covering approximately 20 km under the stated no-load condition. Payload-ready mobility - With a 25 kg walking load, A2 is listed for more than 3 hours of continuous walking and approximately 12.5 km of range. Dual hot-swappable battery design - The dual-slot, dual-battery architecture supports battery replacement without stopping the robot, helping extend field operation workflows. High-torque 12-DOF motion system - The robot uses 12 joint motors and is listed with about 180 N.m maximum joint torque for dynamic legged movement. Rugged all-terrain capability - Official parameters include about 45 degrees slope walking capability, 30 cm maximum stair-step height, and about 0.5-1 m maximum climb height. Integrated perception hardware - The standard A2 configuration lists LiDAR x 1 and HD Camera x 1 for perception and environmental sensing. Development-focused compute - The standard configuration includes an 8-core high-performance CPU for the platform and an Intel Core i7 for user development. Rich external interfaces - A2 provides RS485, CAN, Gigabit Ethernet, USB3.0 Type-C, and 12V / 24V / BAT power output options. Wireless connectivity - Official specifications list Wi-Fi 6 and Bluetooth 5.2 support for modern wireless connection workflows. Weather-resistant industrial design - The standard A2 ingress protection rating is listed as IP56, making it suitable for more demanding test and deployment environments than indoor-only robots. Secondary development support - Unitree lists secondary development as supported, making A2 suitable for robotics researchers, AI teams, and system integrators. Specifications Parameter Value Model Unitree A2 Product Type Industrial-grade quadruped robot Size (Standing) 820 mm x 440 mm x 570 mm Size (Lying Prone) 720 mm x 550 mm x 220 mm Material Aluminum alloy + high-strength engineering plastic Weight (Without Battery) About 35 kg Weight (With Battery) About 42 kg Degrees of Freedom 12 joint motors Joint Bearings Industrial-grade crossed roller bearings Joint Motors Low-inertia, high-speed inner rotor PMSM Max Joint Torque About 180 N.m Range of Motion Body: -58 to 58 degrees; thigh: -134 to 180 degrees / -89 to 225 degrees; shank: -158 to -30 degrees Supply Voltage 50.4 V Power Supply Dual slots, dual batteries Battery Capacity Single battery: 9000 mAh / 453.6 Wh; dual batteries: 18000 mAh / 907.2 Wh Battery Life No load: >5 hours continuous walking, approx. 20 km; with 25 kg load: >3 hours continuous walking, approx. 12.5 km Operating Temperature -20 deg C to 55 deg C Max Standing Load About 100 kg Continuous Walking Load About 25 kg; ideally can reach approximately 35 kg Slope Walking Capability About 45 degrees Stair Climbing Capability Max step height: 30 cm Max Climb Height About 0.5-1 m Speed 0-3.7 m/s; up to about 5 m/s Sensor LiDAR x 1 + HD Camera x 1 Control & Compute Standard: 8-core high-performance CPU (platform) + Intel Core i7 (user development); optional high-computing-power expansion dock External Interfaces RS485 x 2; CAN x 2; Gigabit Ethernet x 2; USB3.0 Type-C (8-core CPU) x 2; USB3.0 Type-C (Intel Core i7) x 2; power output: 12V / 24V / BAT Wireless Connectivity Wi-Fi 6, Bluetooth 5.2 Ingress Protection Rating IP56 Secondary Development Supported Wheel-Leg Replacement Optional Smart OTA Upgrade Continuous upgrades Reference Documents Unitree A2 Official Product Page Unitree SDK2 Official GitHub Repository Application AI robotics research - Use A2 as a full-size mobile robot platform for perception, locomotion, reinforcement learning, and embodied AI experiments. Industrial inspection - Deploy the quadruped platform for inspection-route development in factories, utilities, energy sites, and complex equipment areas. All-terrain mobility testing - Evaluate legged locomotion on slopes, stairs, rough ground, and mixed outdoor surfaces. Payload transport experiments - Test autonomous or assisted carrying workflows using the robot's verified load-related performance parameters. Emergency response research - Build and test robotic mobility concepts for hazardous, difficult-to-access, or post-incident environments. Logistics automation - Explore legged delivery, material transfer, and route-following workflows in indoor and semi-outdoor settings. Perception and mapping - Combine onboard LiDAR, camera sensing, and external compute for mapping, navigation, and environment-awareness projects. Secondary development - Use the official SDK ecosystem and onboard compute configuration for custom control, data collection, and integration workflows. Packing List Description Quantity Unitree A2 quadruped robot main unit 1 FAQ Q1: What is the difference between Unitree A2 and Unitree A2-PRO? Unitree lists both models on the same A2 parameter page. The standard A2 uses LiDAR x 1 + HD Camera x 1 and has an IP56 ingress protection rating, while A2-PRO is shown with LiDAR x 2 + HD Camera x 1 and an IP56-IP67 rating with core components rated IP67. Q2: What is the difference between Unitree A2 and Unitree A2-W? Unitree A2 is the standard legged quadruped platform. Unitree A2-W is positioned as a wheel-leg version for higher-speed mobility workflows; use A2 when the priority is the standard industrial legged platform and A2-W when wheel-leg movement is required. Q3: How long can Unitree A2 operate on battery power? Official A2 data lists more than 5 hours of continuous walking with no load, approximately 20 km, and more than 3 hours of continuous walking with a 25 kg load, approximately 12.5 km. Q4: Does Unitree A2 support hot-swappable batteries? Yes. Unitree describes A2 with a dual-battery parallel design and hot-swappable dual batteries for uninterrupted mission workflows. Q5: What development resources are available for Unitree A2? Unitree lists secondary development as supported. The official Unitree SDK2 repository provides SDK resources for Unitree robot development, and Unitree also provides a document center for additional developer references. Q6: What sensors are included on the standard Unitree A2? The standard A2 specification lists LiDAR x 1 and HD Camera x 1. Do not mix this with the A2-PRO sensor row, which lists two LiDAR units. Q7: What interfaces does Unitree A2 provide for integration? Official specifications list RS485 x 2, CAN x 2, Gigabit Ethernet x 2, USB3.0 Type-C ports for both the 8-core CPU and Intel Core i7 systems, plus 12V / 24V / BAT power output. Q8: What is the ingress protection rating of Unitree A2? The standard Unitree A2 is listed with an IP56 ingress protection rating. For A2-PRO, Unitree lists IP56-IP67 with core components rated IP67. Q9: What payload can Unitree A2 carry while walking? Official A2 data lists a continuous walking load of about 25 kg, with a note that it can ideally reach approximately 35 kg. The maximum standing load is listed as about 100 kg. Q10: Is Unitree A2 suitable for outdoor and uneven terrain research? Yes. A2 is designed for rugged mobility, with official parameters including about 45 degrees slope walking capability, 30 cm maximum stair-step height, and about 0.5-1 m maximum climb height.
