Feature:1. 2.402GHz to 2.480GHz: 2.402GHz to 2.480GHz frequency range, 5V charging voltage, head mounted use, lightweight and portable.2. BT5.0: Motorcycle helmet earphone adopts BT5.0, stable transmission, automatic answering of calls, suitable for all kinds of helmets.3. Noise Reduction Chip: The built in noise reduction chip of Motorcycle earbuds can effectively identify the original sound, and the sound is clearer. Noise suppression technology minimizes noise such as wind noise and engine noise.4. Long Standby Time: Motorcycle earbuds have built in large capacity lithium battery, long standby time, 450mAh battery, 720 hours long standby time.5. ABS Material: The Motorcycle helmet intercom is made of high quality sturdy ABS material, which is wear resistant and durable, and can be used for a long time.Specification:Item Type: Helmet HeadphonesMaterial: ABSChannel: StereoHow To Use: Head MountedBT Name: BT23 BT EarphoneBT Version: V5.0Frequency Range: 2.402GHz to 2.480GHzCharging Time: About 3 HoursStandby Time: ≤720 HoursContinuous Working Time: ≤16 HoursTransmission Distance of Microphone: ≤1meterUnilateral Headset Power: 0.5WBuilt in Lithium Ion Battery: 450mAh (Ship with Inbuilt Battery)Charging Voltage: 5VHow to Use:Install to usePackage List:1 x Wireless Headphone1 x USB Charging Cable1 x User Manual