Description This item is a helmet-in headset. It should be put into the helmet to fix tightly. With 2 soft and comfortable cushions, it will not cause much pressure to your ear if you wear it for a long time. It has a built-in microphone so you can answer phone call if there is a call coming without taking your hand. Feature - Equipped With CSR Bluetooth 4.0 technology, it is compatible with most kinds of smartphone, providing efficient and convenient communications in the riding. - Hi-Fi speakers make you enjoy crystal clear voice and music from your cell phone - Hands-free, built-in microphone enables you to answer phone without holding your phone during driving. - Set-in rechargeable Li-ion battery, long stand-by and working tim. - Please do not turn up the volume too loudly in driving. Specification - Color: Black - Material: Plastic - Package Size: 18x12x4/7.1x4.7x1.6inch - Battery capacity:150mAh battery. - Bluetooth Chip Brand: CSR - Bluetooth Version: 4.0+EDR - Bluetooth Range: 10 meters - Frequency: 2.402-2.480GHz - Li-ion Battery: 3.7V/90mAh - Charging Voltage: DC 5V - Charging Time: About 2.5H - Working Time: About 6H - Standby Time: About 60H 1 x Helmet Bluetooth Headset 1 x USB Charging Cable 1 x User Manual