Feature: 1. BLUETOOTH 5.0 TECHNOLOGY: Helmet headset uses bluetooth 5.0 technology standard for stable transmission, wider coverage, faster speed and lower power consumption. 2. ONE BUTTON FOR CLEAR CALLS: Helmet bluetooth headset has built in noise cancellation technology, presenting hifi stereo sound effect and clear calls with one click. 3. 4 BUTTON DESIGN: Motorcycle helmet headphones are designed with 4 keys, simple music control and dialing, more convenient operation. 4. HANDS FREE: Motorcycle helmets headset automatically answers incoming calls, no need to get the phone to answer calls, safer and more convenient. 5. LONG STANDBY TIME: Helmet bluetooth headphone has a built in 450mAh rechargeable lithium ion battery for long standby time and long working time. 6. SMALL AND SIMPLE: Motorcycle sports headset is compact, simple and elegant, and the installation is not cumbersome, and the comfortable lacquered shell makes people love it. Specification: Item Type: Helmet Bluetooth Headset Model: DK11 Material: ABS Color: Black Battery Type: Built In 450mAh Lithium Battery (Included) Bluetooth Version: 5.0 Frequency: 2.402-2.480GHz Bluetooth Range: Approx. 20-30m / 65.6-98.4ft. Package List: 1 x Helmet Bluetooth Headset2 x Hook and Hoop Fasteners2 x Sticker1 x Charging Cable1 x Instruction Book