Using the latest Bluetooth CSR4.2 + technology. transmission.Ultralow power consumption, all Bluetooth devices, automatic Answering function.Phone switchable manual answering function.Safe and fast, builtin microphone antiinterference high quality that allows you to answer and hang up calls handsfree.Bluetooth version: V4.2 +Standby mode: 120 hoursTransmission distance: 10MMicrophone distance: 1 meterLithium Battery: 500MahColour:blackMaterial:plasticPackage Contents:1 set of motorcycle helmet bluetooth headphonesOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is + 13cm.