Unitree A2 ========== .. The provided tutorial will assist you with understanding, setting up, and operating the Unitree A2 quadruped robot. .. The tutorial topics are listed in the left column and presented in the recommended reading order. .. image:: media/figures/a2_product.png :alt: Unitree A2 Industrial Quadruped Robot :width: 100% :class: mbsrounded The **Unitree A2** is an industrial-grade quadruped robot engineered for demanding field operations such as inspection, security patrol, mapping, and logistics. Built around twelve high-torque joint actuators, dual industrial LiDAR, and hot-swappable batteries for 24/7 duty cycles, the A2 combines rugged durability with the open control interfaces required for research, autonomy development, and commercial deployment. .. meta:: :description: Official documentation for the Unitree A2 industrial quadruped robot. Specifications, operation, and SDK development guide for inspection, security, and autonomy applications. :keywords: Unitree A2, quadruped robot, industrial robot dog, A2 SDK, unitree_sdk2, robot inspection, security patrol robot, A2 specifications, DDS, CycloneDDS Rugged Industrial Mobility `````````````````````````` The A2 is built for the field. Twelve high-performance electric joint actuators deliver up to **180 N·m** of torque, enabling a top speed of up to **5 m/s**, a maximum step height of **300 mm**, and slope traversal of up to **±45°**. An ingress-protected chassis (**IP56** outer body, **IP67** internal compartments) allows operation across an ambient range of **−20 °C to +55 °C**, in dust, rain, and uneven terrain. Continuous Operation and Heavy Payloads ``````````````````````````````````````` Two **9,000 mAh hot-swappable batteries** support uninterrupted, around-the-clock operation by allowing battery exchange without powering down. The A2 carries a **25 kg** payload while walking and supports up to **100 kg** in a stationary stance, providing ample capacity for sensor packages, manipulators, and mission equipment. .. figure:: media/figures/a2_inspection.jpg :width: 100% :align: center :alt: Unitree A2 autonomous inspection deployment :class: mbsrounded Autonomous inspection deployment | 360° Perception ``````````````` Dual industrial LiDAR units (front and rear) provide full **360° spatial awareness** for mapping, obstacle avoidance, and autonomous navigation. An HD camera with an integrated front LED enables low-light operation, while proprioceptive sensors (joint encoders and an IMU) support stable closed-loop locomotion and state estimation. Open Control and Developer-Friendly Design `````````````````````````````````````````` The A2 exposes fully open, low-latency control interfaces over the official ``unitree_sdk2`` (C++) and ``unitree_ros2`` packages, communicating via DDS. It is suitable for: - Autonomous inspection and security patrol - SLAM, mapping, and outdoor navigation research - Whole-body and locomotion control development - Multi-robot and fleet coordination .. image:: media/figures/a2_gallery_1.jpg :alt: Unitree A2 operating in the field :width: 100% :class: mbsrounded | .. note:: For SDK setup, network configuration, and example commands, see the :doc:`a2_sdk` section. The official developer reference is maintained by Unitree at the `A2 SDK Development Guide `_. Specifications ============== .. figure:: media/figures/a2_parameters.jpg :width: 100% :align: center :alt: Unitree A2 parameter specification diagram :class: mbsrounded Official Unitree A2 parameter diagram | Physical & Mechanical ````````````````````` +-------------------------------------------+----------------------------------------------+ | **Parameter** | **Specification** | +===========================================+==============================================+ | Dimensions (L × W × H, standing) | 720 × 550 × 820 mm | +-------------------------------------------+----------------------------------------------+ | Weight (with battery) | ~37 kg | +-------------------------------------------+----------------------------------------------+ | Weight (without battery) | ~31 kg | +-------------------------------------------+----------------------------------------------+ | Total Degrees of Freedom | 12 (3 per leg) | +-------------------------------------------+----------------------------------------------+ | Joint Actuators | 12 high-performance electric joints | +-------------------------------------------+----------------------------------------------+ | Peak Joint Torque | Up to 180 N·m | +-------------------------------------------+----------------------------------------------+ | Ingress Protection | IP56 (outer body) / IP67 (internal) | +-------------------------------------------+----------------------------------------------+ | Operating Temperature | −20 °C to +55 °C | +-------------------------------------------+----------------------------------------------+ | Mobility & Performance `````````````````````` +-------------------------------------------+----------------------------------------------+ | **Parameter** | **Specification** | +===========================================+==============================================+ | Maximum Speed | Up to 5 m/s | +-------------------------------------------+----------------------------------------------+ | Maximum Step Height | 300 mm | +-------------------------------------------+----------------------------------------------+ | Maximum Slope | ±45° | +-------------------------------------------+----------------------------------------------+ | Payload (walking) | 25 kg | +-------------------------------------------+----------------------------------------------+ | Payload (stationary) | Up to 100 kg | +-------------------------------------------+----------------------------------------------+ | Operational Range (unloaded) | ~20 km | +-------------------------------------------+----------------------------------------------+ | Operational Range (loaded) | ~12.5 km | +-------------------------------------------+----------------------------------------------+ | Power & Endurance ````````````````` +-------------------------------------------+----------------------------------------------+ | **Parameter** | **Specification** | +===========================================+==============================================+ | Battery | Dual 9,000 mAh hot-swappable packs | +-------------------------------------------+----------------------------------------------+ | Runtime (unloaded) | ~5 hours | +-------------------------------------------+----------------------------------------------+ | Runtime (full load) | ~3 hours | +-------------------------------------------+----------------------------------------------+ | Hot Swap | Yes (24/7 operation supported) | +-------------------------------------------+----------------------------------------------+ | Sensing & Compute ````````````````` +-------------------------------------------+----------------------------------------------+ | **Parameter** | **Specification** | +===========================================+==============================================+ | LiDAR | Dual industrial LiDAR (front + rear, 360°) | +-------------------------------------------+----------------------------------------------+ | Camera | HD camera with front LED illumination | +-------------------------------------------+----------------------------------------------+ | Proprioception | Joint encoders + IMU | +-------------------------------------------+----------------------------------------------+ | Onboard Compute | Embedded octa-core CPU | +-------------------------------------------+----------------------------------------------+ | Optional Compute | Intel Core i7 module | +-------------------------------------------+----------------------------------------------+ | Connectivity ```````````` +-------------------------------------------+----------------------------------------------+ | **Interface** | **Specification** | +===========================================+==============================================+ | Wireless | Wi-Fi 6 + Bluetooth 5.2 | +-------------------------------------------+----------------------------------------------+ | Wired | Gigabit Ethernet (RJ45) + USB-C | +-------------------------------------------+----------------------------------------------+ | Optional | 4G LTE + GPS | +-------------------------------------------+----------------------------------------------+ | .. warning:: **Safety Notice:** The A2 is a high-power industrial robot capable of rapid, forceful motion. Maintain adequate clearance during operation, keep the emergency stop accessible, and never allow untrained personnel to operate the robot. **Civilian Use Only:** This product is intended exclusively for lawful civilian applications. Hazardous modifications and deployment in dangerous contexts are strictly prohibited. .. note:: **Specification Source:** Values summarised here are drawn from Unitree's published material and may vary by firmware version, configuration, and operating conditions. Always cross-reference the official `Unitree A2 SDK Development Guide `_ before development or deployment. | .. image:: media/figures/a2_gallery_2.jpg :width: 100% :align: center :alt: Unitree A2 in operation :class: mbsrounded | .. toctree:: :hidden: :caption: QRE A2 Overview a2_overview .. toctree:: :hidden: :caption: Operation operation .. toctree:: :hidden: :caption: SDK a2_sdk .. toctree:: :hidden: :caption: Getting Help getting_help getting_involved faq