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 measurement Description: Material: ABS, silicone Size: 12.2*9.8*5.7cm Battery: 850mAh Charging time: about 2.5 hours Charging voltage: 5V Charging current: 470mA Speaker Diameter: 40MM Speaker impedance: 32ohm Horns response frequency: 0-20KHz Microphone Diameter: 6.0*2.7 Microphone sensitivity: -38±3db Microphone impedance: 2.2K Wireless programme: Bluetooth-compatible 5.2 Power supply voltage: VDD3.8V Operating current: Standby current: Temperature range:-1060°C Intercom wireless transmission range: 400M Transmission power: 20db Sensitivity: -85db Frequency range:2.402GHZ-2.480GHZ External interface: TYPE_C Audios signal-to-noise ratio: 60db Distortion: 0.01 ％ Chip: QCC3024 Mobile phone call distance: 10M Standby time: about 260 hours Working time: about 25 hours Package List: 1 x Earphone