UiiSii BT-260 in-ear headphone has bluetooth connectivity, CSR8645 bluetooth chip, 10 meter effective distance, titanium dynamic driver for clear and detailed sound, IPX4 waterproof, magnetic connection, mems microphone, perfect for work out, 1.5 hours charging time, talk / music time 8 hours, 280 hours standby time, 3.7v / 120mAh battery.