Origin:Mainland China Features: 1) Enjoy music wirelessly while driving , receiving GPS navigation voiceinstructions from Bluetooth equipped GPS device 2) Bluetooth V5.2 , with 35 hours continuous music playing time at max volumeand supports connecting with 2 mobile phones / devices.Answer calls automatically for bicker's safety 3) 3 big waterproof external control buttons , easy control and install on helmetS ) Combined with microphone , pick up calls and conduct calls directly 4) Excellent stereo sound quality.Note: These are headset for Motorcycle helmet, Not an intercome, can not talk or connect with each other before pairing with yourself phone. 5) Functions: Next Song / Previous Song.Volume Up / Volume Down, Play / Pause.Hang Off, Redial9 ) Could activate voice assistant Specifications: 1) Bluetooth: Bluetooth V5.2 with EDR / HSP / A2DP / AVRCP and HFP 2) Rated Power: RMS 10mw x 2 3) Speaker Unit: 24 / 30mm. 4) Frequency Response: 20HZ-20KHZ: 5) Battery: 3.7V / 300mah Li-polymer battery, with NTC , OVP OCP protection PCB 6) Play / Talk Time: over 35 hours 7) Charging Time: DC 5V approx 2 hours 1. Manually pairing Step 1: In the shutdown state, long press dialing button for 3 seconds, and tie red and blue lights of the LED indicator will flicker alternately to enter the bluetooth pairing state. Step 2: Open the bluetooth of the mobile phone, enter the bluetooth list, select the bluetooth name (BT Audio) and click to connect.The LED indicator light turns to blue and flashes slowly when the connection is successful. 2. Automatically re-pairing (after paired) If a cellphone has been paired with the headset before, it will be automatically re-paired when the headset is turned on again.If the phone and headset is out of efficient range, it will disconnect, but when it back to the efficient range, it will connect automatically again. Material: plastic colour: black Package Contents: 1 x SK-33B2 Helmet Headphone Kit 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.