Item Type: Helmet BT Headset Material: ABS Model: T4 Color: Black Battery Type: Built in 180mAh Lithium Battery (Included) BT Version: 5.0 Frequency: 2.402-2.480GHz BT Range: Approx. 10-20m/32.8-65.6ft Package List 1 x Helmet BT Headset 1 x Charging Cable 1 x Instruction Manual 1[Stable And Long Range] Helmet headset using Bluetooth 5.0 technology standard, stable transmission, wider coverage, faster speed, lower power consumption. 2[Auto Answering] Helmet Bluetooth headphone is easy to use, answer the phone without taking out the phone, automatically answer the call, safer and more convenient. 3[3 Key Operation] Three key design of the motorcycle helmet Bluetooth headset, simple music control and dialing, more convenient operation. 4[Noise Reduction] Wireless motorcycle headphone with built in noise cancellation technology, presenting high definition stereo sound and clear calls with one click. 5[Rechargeable] Motorcycle sports headset with built in 180mAh rechargeable lithium battery, long standby time. Lacquered shell, compact and simple, easy to install.