Description: Features: brand new and high quality. Helmet Bluetooth-compatible headset allows you to pick up hands-free call safely. Truly free your hands. Never worry about missing any call when riding a motorcycle. It is very easy to install into a helmet. Remove the side padding from the inside of the helmet(if it can be removed) and place the devices and at the height of your ears. Answer mode switching: automatic answer mode/normal mode(press the middle button) Press the A button to turn on and turn off the earphone. Press B button one for time, Increase the volume to the highest tone and continue to press to minimize Also you can adjust volume via your for smart phone. Long press B button,next song. Automatic answering function (can be answered manually within 10s, 10s if there is no operation, directly answer automatically) Suitable for smart phone or tablet with Bluetooth-compatible function With a micro USB cable,your can charge the earphone ,also you can use micro USB cable charge Android cellphones or tablet with Micro USB port. Special features: Bluetooth-compatible version: 4.1 Rechargeable lithium battery: 250 mAh Bluetooth-compatible distance: 10 meters Standby time: about 70 hours Charging time: about 4 hours Continuous time: about 7 hours Bluetooth-compatible Name: L1 M Material: plastic Color: Black Size: earphone diameter: 4x4x1cm,earphone cable length: 48cm,mic cable length: 19cm USB charging cable length: 79cm Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1x Helmet Bluetooth-compatible Headset 1 x Micro USB Charging Cable 1 x English User Manual 4 x Stickers