Product Specifictions: 1. Bluetooth version: V5.0+CSR(updated,a little different with the manual) 2. Standby: 120Hours 3. Transmission distance: 10M (transmission distance varies depending on environmental factors and mobile phone Bluetooth devices) 4. MIC distance: ≤ 1 meter 5. Lithium battery: 3.7V/500mA 6.Frequency:2.402 Ghz-2.480 Ghz. 7.Bluetooth Pairing Distance:20-30 meters(Depending on device) 8.Playback time:30 hours. 9.Charging time:<=2 hours. 10.Standby time:<=360 hours. 11.Connection name:BT12 Using the latest CSR5.0+EDR Bluetooth technology, superior signal transmission, ultra-low power consumption, all Bluetooth devices, automatic answering function, switchable manual answering phone function, safe and fast, built-in high quality anti-interference microphone It can effectively realize hands-free answering and hang up calls. High fidelity sound , support last song or next song function, volume addition and subtraction, playback pause, automatic callback and other functions, easy to operate. Product includes: 1set Helmet Earphones(with packing box)