Specification:Item Type: Motorcycle Helmet HeadphoneMaterial: ABS Version: 5.0Headphone Battery: lithium battery 250mAh (battery included) Range: Approx. 15m / 49.2ftMicrophone Transmission Distance: Approx. 1m / 3.3ftFrequency: 2.402-2.480GHzSpeaker Unit: Approx. 30mm / 1.2inMaximum Volume: 112dB: -85dbStandby Time: about 700 hoursWorking Time: about 16 hoursCharging Time: about 2 hoursApplicable to: various types of helmetsHow to Use:1. In the shutdown state, press and hold the dial button for 3 seconds, the red and blue lights of the LED indicator flash alternately to enter the pairing state.2. Turn on the of the mobile phone, enter the list, select the name (T2) and click Connect. After the connection is successful, the LED indicator will turn blue and flash slowly.Package List:1 x Wireless Helmet Headset1 x Micro-USB Charging Cable1 x Manual4 x Hook and Fastener3 x Sponge Cover