How 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 bluetooth pairing state. 2. Turn on the bluetooth of the mobile phone, enter the bluetooth list, select the bluetooth name (T2) and click Connect. After the connection is successful, the LED indicator will turn blue and flash slowly. Specification: Item Type: Motorcycle Helmet Headphone Material: ABS Bluetooth Version: 5.0 Headphone Battery: lithium battery 250mAh (battery included) Bluetooth Range: Approx. 15m / 49.2ft Microphone Transmission Distance: Approx. 1m / 3.3ft Frequency: 2.402-2.480GHz Speaker Unit: Approx. 30mm / 1.2in Maximum Volume: 112dB: -85db Standby Time: about 700 hours Working Time: about 16 hours Charging Time: about 2 hours Applicable to: various types of helmets Package List: 1 x Wireless Helmet Headset 1 x Micro-USB Charging Cable 1 x Manual 4 x Hook and Loop Fastener 3 x Sponge Cover