Description: Bluetooth version: Bluetooth 5.1 Receiving distance: barrier-free 10m Speaker size: 40mm Charging time: 2-3 hours Life time: 50 hours (maximum volume) Standby time: 300 hours Battery capacity: 600 mA Specifications: 1. Long Hours Playtime the battery can last Long hrs. Upgraded battery allow you have Long hours music enjoyment, you can use it as a wired headset with provided audio cable. 2.More Comfort Fit exceptional soft protein earcup, adjustable headband, skin-friendly rubber layer provide you more comfort, more durability. while the headband's rotating joints automatically adjust the angle of the ear cups to fit your head. Reduces preure on ear, allow your to find the perfect fit and a long-listen comfort. 3.TF Slot & Foldable Design The TF slot support within 32GB TF card, Free yourself from harament of phone. Foldable design make it easier to carry and save your space, you can bring it wherever you want to go. (TF mode only support for MP3 format.) 4.Bluetooth 5.1 & Easy Control Compatible with most of bluetooth devices, such as PC, Cellphone, tablets, TV, steady connection within 10M. Noise reduction HD mic, bring you a clear hands-free call experience, and answer any calls conveniently. Simple control help you handle any call, song switch, volume change. (the mic only work in wirele mode.) Package Included: 1 * Bluetooh Headset 1 * Aux Cable 1 * USB Cable