Model:B6890ZXF4340FJ9648 Name:Wireless Bluetooth headset Bluetooth receiving distance:10m Bluetooth chip: 5.1 version Standby time:40 hours Use time:about 10 hours Charging time:2 hours Colour: Grey Red Blue Green Black Transmitting Frequency: 2402MHZ- 2480MHZ Usage mode:Bluetooth/TF/3.5mm wired link Compatible system: Android, IOS, WIN.(only need device with Bluetooth function, can connect quickly) Features. One piece telescopic swivel bar, which can be extended smoothly or stabilised in the position you want, always fits snugly. Closed ear cups to shield against noise, the ear cups are soft and comfortable to wear while shielding against outside noise. Full wrap design with memory rebound and soft, skin-friendly overlapping mesh earmuffs. Fast matching transmission without delay, Bluetooth 10M unobstructed transmission distance, high-speed and stable transmission Long life and fast charging, powerful battery life allows you to listen to music without any worries