The B1 opened Unitree's industrial line in 2021 and set the template later taken over by the B2. It weighs about 50 kg including a 5 kg battery, measures 1126 x 467 x 636 mm standing and folds to 1202 x 467 x 297 mm for transport. Unitree rates it for a 20 kg load in continuous walking and up to 80 kg standing still, with a 20 cm maximum step when climbing stairs. The 18,000 mAh, 51.8 V pack (932.4 Wh) gives five hours of standing endurance or roughly two hours of continuous walking unloaded. Perception is unusually generous for its era: five Intel RealSense D430 depth cameras feeding three Jetson Xavier NX modules alongside an Intel i5-1135G7. The headline feature is the IP68 rating, which makes the B1 fully submersible and suitable for substations, tunnels and other wet or dusty sites. Unitree does not publish a top speed or a price for the B1; the model has since been positioned behind the B2 and B2-W in the company's catalogue.