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 × 1 and HD Camera × 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 × 440 mm × 570 mm Size (Lying Prone) 720 mm × 550 mm × 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°; thigh: −134° to 180° / −89° to 225°; shank: −158° to −30° 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 (~20 km); with 25 kg load: >3 hours (~12.5 km) Operating Temperature −20°C to 55°C Max Standing Load About 100 kg Continuous Walking Load About 25 kg; ideally up to ~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; peak up to ~5 m/s Sensor LiDAR × 1 + HD Camera × 1 Control & Compute Standard: 8‑core high‑performance CPU (platform) + Intel Core i7 (user development); optional high‑compute expansion dock External Interfaces RS485 × 2; CAN × 2; Gigabit Ethernet × 2; USB3.0 Type‑C (8‑core CPU) × 2; USB3.0 Type‑C (Intel i7) × 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 1 Standard factory configuration 1 set 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 × 1 + HD Camera × 1 and has an IP56 ingress protection rating, while A2‑PRO is shown with LiDAR × 2 + HD Camera × 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 (~20 km), and more than 3 hours of continuous walking with a 25 kg load (~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 × 1 and HD Camera × 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 × 2, CAN × 2, Gigabit Ethernet × 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.
