Features Play during charging. There is a built-in microphone for incoming / outgoing calls. Support to connect 2 mobile phones simultaneously The battery can be played continuously for more than 10 hours. Standby can be up to 300 hours.Receiving signals up to 15 meters, noise cancellation Supports all mobile devices iOS / Android / Windowsphone Comes with a clip Increase ease of usewith headphones (very good sound), 3.5 mm AUX cable and charging cable Supports all types of devices with AUX inputs for audio devices. Connect headphonesAnswer all activities Listen to music both in the car home while exercising. Specifications Bluetooth version: 4.1 Standby time: 300-320 hours Transmission distance: 10M Charging voltage: DC 5V Talk time: 8-9 hours Battery capacity: 150mAh Charging time: about 2 hours Package 1x Bluetooth headset 1x USB charging 1x Earmuffs 1x Manual