Features: *High quality: The product shell is made of ABS material, the surfaces has been waterproofed, and the internal silicone inlaid structure is deeply waterproof, light-resistant, and durable.*Waterproof and noise reduction: Helmets Bluetooth-compatible intercom headsets usually have certains noise reduction and waterproof functions and are suitable for different outdoor work or sports environments.*Super long battery life: The headset uses a super-large-capacity rechargeables battery and Type-C charging cable, making it more convenient for you to use.*Hands-free calling: The headset is equipped with a microphone, which can realize hands-free calling, allowing users to conveniently answer and make calls while driving or outdoor activities.*Real-time call: You can make real-time calls with other people through the Helmets Bluetooth-compatible intercom headset, such as communicating with fellows cyclists.Notice:*Actual color may be slightly different from the image due to different light effect*Please allow 1-3cm deviation due to manual measurementDescription:Material: ABS, siliconeSize: 12.2*9.8*5.7cmBattery: 850mAhCharging time: about 2.5 hoursCharging voltage: 5VCharging current: 470mASpeaker Diameter: 40MMSpeaker impedance: 32ohmHorns response frequency: 0-20KHzMicrophone Diameter: 6.0*2.7Microphone sensitivity: -383dbMicrophone impedance: 2.2KWireless programme: Bluetooth-compatible 5.2Power supply voltage: VDD3.8VOperating current: Standby current: Temperature range:-1060CIntercom wireless transmission range: 400MTransmission power: 20dbSensitivity: -85dbFrequency range:2.402GHZ-2.480GHZExternal interface: TYPE_CAudios signal-to-noise ratio: 60dbDistortion: 0.01 Chip: QCC3024Mobile phone call distance: 10MStandby time: about 260 hoursWorking time: about 25 hoursPackage List:1 x Earphone