This Bluetooth headset supports all answer the phone with a Bluetooth cell phone， designed for motorcycle helmets to create high-quality Bluetooth headset!Using high-quality materialsBluetooth version: BT4.0Chip: CSR 8610Talkback: NoneBattery capacity: 260Battery Type: PolymerCharge and discharge times: 500Operating voltage: 3.3-4.2Talk Time: 8HStandby time: 150HCharging time: 2HRadio frequency: NoneRDS: NoneSpeaker power: 0.15WWaterproof: Built helmet use!Have TTS: NoneHave automatic volume adjustment: noOperating temperature range: -10 ℃ to + 45 ℃ (minimum and maximum operating temperature)Charger Specification: USB charging cable