Features: Single-sided design, which is ideal for having an open ear to your surroundings on calls. This headset adopts the latest BT 5.0 technology, fast connection and stable transmission. Lightweight headset with adjustable headband fits any head shape; soft earpad & anti-slip pad stays securely in place for all-day comfort. Easy to use, You can easily control the music/calls with buttons on the headset(volume +/-, power on/off, answer/reject calls, switch songs). The rotatable microphone is able to accurately pick up the sound, you can freely adjust the angle of the microphone to make the sound clearer and louder. Built in 300mAh rechargeable lithium battery, provides 30-60 hours of talk time, about 100 hours of standby time, with charging base, convenient and fast charging. Specifications: Type: Headset Material: ABS, Soft protein Color: Black BT Version: 5.0 Working distance: 30m Working voltage: 3.7V Charging voltage: 5V Battery capacity: 300mAh Charging time: 1-2 hours Loudspeaker size: 40mm Impedance: 32 Sensitivity: 1085 dB Frequency response range: 20-20000Hz Package Size: 16*16*7cm / 6.3*6.3*2.8in Package Weight: 193g / 6.8oz Package List: 1 * Headset 1 * USB Charging Cable 1 * Charging Base 1 * User Manual