1 ) Enjoy music wirelessly while driving , receive GPS navigation voice instructiofrom Bluetooth equipped GPS device : 2 ) Bluetooth V5 . 2 , with 35 hours continuous music playing time at max voland supports connecting with 2 mobile phones / devices 3 ) Answer calls automatically for bickers safety 4 ) big waterproof external control buttons , easy control and install on helmet : 5 ) Combined with microphone , pick up calls and conduct calls directly Note:These are headset for Motorcycle helmet,Not an intercome,can not talk or connect with each other before pairing with yourself phone. Excellent stereo sound quality . Bluetooth : Bluetooth V5 . 2 . with / / A2DP / AVRCP and HFP Rated Power : RMS 10mwx 2 : Speaker Unit : 24o'hm / 30mm : Frequency Response : 20HZ-20KHZ . Battery : 3 . 7V / 300mah Li-polymer battery , with NTC , OVP , OCP protection PCB : Play / Talk Time : over 35 hours Charging Time : DC 5V 2-3 hours Functions : Song / Previous Song . Volume Up / Volume Down , Play / Pause .Hang Off , Redial Could activate voice assis Colour:black Material:plastic Package Contents: 1 x Helmet Headset 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.