Specifications:1.BT Version: V5.02.BT Distance: 10m3.Charging Time: about 1-2 hours4.Standby Time: about 80 hours5.Music Time: about 2.5 hours6.Talking Time: about 3 hours7.Earphone Battery: Polymer Lithium Battery 40mAh8.Battery Box Battery: Polymer Lithium Battery 250mAh9.Audio transmission format: HFP/A2DP/HSP/AVRCPPackage Included:1 * One pair of headsets1 * Charging cable1 * User ManualNote:When purchasing the tws headset, please read the following instructions: Due to long-term transportation, the power of the tws earphone will be exhausted. You will not be able to use the headset when you receive the package. It may be powered off. The first thing to do is to charge the headset box for 30 minutes. Very important. Thank you!