The UiiSii B1 Bluetooth Earphone equipped with Bluetooth version 5.0 and CSR bluetooth chip, the wireless connection is more stable, the power consumption is lower, and it is compatible with more bluetooth devices. This earphone is designed with IPX5 sweat and waterproof design, rain and sweat proof. This UiiSii earphone has 3.7V/73mAh battery capacity, Music/Play/Talking time, ≥160h Standby time and ≥10m Transmission range. The whole Bluetooth earphone has rich music expressive force, in the composite ergonomic design, flexible TPU collar, back and shoulder wear, left and right balance design because of it’s wearable design, 1.5 hours charging time, ≥5hours Music/ Play/ Talking time. This Bluetooth ear phone has no warranty.