Dimensions (H×W×D): folded size 683×520×440mm (683mm refers to the distance from the top of the head to the bottom of chassis wheels, 520mm for chassis width and 440mm for chassis thickness), extended size approx. 1600×520×440mm (1323mm refers to the distance from the top of the head to the bottom of chassis wheels, 520mm for chassis width and 440mm for chassis thickness). Overall weight: approx. 30kg. Joint output bearing: crossed roller bearing and double-groove ball bearing. Joint motor: low-inertia high-speed inner rotor permanent magnet synchronous motor for enhanced response speed and heat dissipation. Maximum arm load: approx. 2kg. Total length of upper arm and forearm: 420mm. Joint range of motion: waist joint yaw ±150°, head joint yaw ±115° and pitch ±36°. Wiring mode: hollow routing and internal wiring. Joint encoder: dual and single encoders. Cooling system: partial air cooling. Power supply: standard removable chassis battery and external power supply for R1-A-D