TDS-E2 Bluetooth headset is a high-tech wireless headset, which is based on Bluetooth technology and designed to be used when driving cars. As a world famous brand, it is elegant and fashionable, enjoyable with clear sound flows, so tiny around your ear that it can free your hand in safe driving. With power as little as 0.001W, which keeps your brain from harming by mobile phone current radiation. Features: 1) Bluetooth Version: CSR V1.1, V1.2 2) Frequency: 2.4GHz 3) Profiles supported: headset profile and hands-free profile 4) Operation range: up to 10 meters 5) Talk time: up to 6 hours 6) Standby time: up to 200 hours 7) Weight: 10g 8) Li-poly battery, 130mAh 9) Charging time: about 2 hours Packing: Black plastic square crust 20sets/ctn Carton dimensions: 53 x 21.5 x 20cm Headsets weight: 10g N.W.: 4.49kg G.W.: 5.29kg