Specification:Color: Red/BlackMaterial: ABSBluetooth version: 4.1Connection distance: 8 metersFrequency: 2.402GHZ-2.480GHZChannel: StereoPrompt language: Chinese and English (switchable)Wearing method: ear typePower supply: built-in 80mAh lithium batteryCharging time: about 2 hoursTalk time: about 5 hoursCharging method: micro USB chargingInput voltage: DC 5VProduct size: 7*2*2cm A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A