Using the latest Bluetooth CSR4.2 + technology. transmission. Ultra-low power consumption, all Bluetooth devices, automatic Answering function.Phone switchable manual answering function. Safe and fast, built-in microphone anti-interference high quality that allows you to answer and hang up calls hands-free. Bluetooth version: V4.2 + Standby mode: 120 hours Transmission distance: 10M Microphone distance: ≤ 1 meter Lithium Battery: 500Mah Colour:black Material:plastic Package Contents: 1 set of motorcycle helmet bluetooth headphones Only 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 +/- 1-3cm.