Feature:1. Built‑in 5.0 is compatible with almost all mobile devices that support bluetooth, installation and removal are very simple, basically suitable for all types of motorcycle helmets.2. The maximum effective distance is 20‑30 meters, allowing you to stay connected with your mobile phone, enjoy music, and provide efficient and convenient communication during riding.3. The helmet headset allows you to answer calls safely, hands‑free function, truly free your hands, when riding a motorcycle, don't worry about missing any calls.4. Easily set up the device according to the sound reminder, support for iOS battery display, know when to charge.5. High‑fidelity headphones and advanced noise reduction functions allow you to enjoy high‑quality music while riding.How to Use:1. Install the headset inside the helmet.2. Long press the power button for three seconds, the headset is turned on and enters the bluetooth pairing state.3. Turn on the bluetooth of the mobile phone, you can use it after pairing.Specification:Item Type: HeadsetMaterial: ABSBluetooth Version: 5.0Frequency: 2.402GHz-2.480GHzRange: 20~30 Meters/65.6- 98.4ft(Depending on the Surrounding Environment of the Equipment Such As Obstacles, etc.)Microphone Transmission Distance: ≤1m/3.2ftBattery Capacity: 180mAh Lithium Battery (Shipped with Battery)Playing Time: About 8 HoursCharging Time: About 1 HourStandby Time: About 160 HoursModel: MH04 Package List:1 x Headset2 x Hook and Loop1 x Charging Cable1 x Manual