・Bluetooth-compatible 5.0 Stable Transmission:Using Bluetooth-compatible 5.0 technology standard,wider coverage,faster speed,lower power consumption ・Long Battery Life:the headset built-in 450mAh large capacity Lithium battery,no need to charge the headset frequently,it can satisfy your day's use ・Helmet headphone is Dustproof and waterproof,which is durable without fear of wind and rain ・Comes with FM,not only a headset but also as an FM radio,you can automatically search for radio stations ・Helmet Headset Application Range:climbing,rock climbing,skiing,cycling,etc. or outside sports Specifications: ・BT version:5.0 ・Frequency range:2.402GHz~2.480GHz ・BT distance:20~30m (depending on a mobile phone) ・Lithium battery capacity:3.7V/450mAh ・Charging voltage:5V ・Working time:23 hours (according to usage conditions) ・Charging time:about 2 hours ・Standby time:about 360 hours Package included: ・1 x Wireless Headset ・1 x Speaker Kit ・1 x Earphone Clip ・1 x Type-C Charging Cable ・1 x Hook & Loop ・4 x Screws ・1 x Tool ・1 x English and Chinese Manual ・Other items not included