Unitree B2 Fire Rescue B2-XF1-B, with Dual-Lens PTZ Camera The Unitree B2 Fire Rescue B2-XF1-B is a four-legged firefighting robot designed for professional firefighting and rescue operations. The system combines the Unitree B2 base robot with industrial gas sensors, a 360° camera, and a dual-lens PTZ camera with thermal imaging capability. Its rugged design is engineered for hazardous operating environments.