1、HIFI STEREO, NOISE CANCELLATION: You can enjoy the best HiFi stereo sound quality from helmet Bluetooth headset with professional sound decoding chip, 40mm diameter, 0.3W speaker unit with premium sound and more volume. It also features ENC (Environmental Noise Cancellation) technology and microphone for clearer calls. 2、STABLE AND FAST SIGNAL TRANSMISSION: The helmet headset uses the latest 5.0 Bluetooth version, which is more compatible and can be paired with most Bluetooth devices, such as cell phones, navigators, and GPS. Fast pairing, automatic reconnection. Stable signal, low power consumption, 10m/32.8ft connection distance, incoming calls are automatically announced and answered. 3、LARGE BATTERY CAPACITY AND EASY TO USE: Helmet headphone uses professional headset batteries with long battery life. The keys are raised design and can be used accurately even when wearing gloves. One hand to realize volume increase or decrease, song switching, double click on the minus key to start the sound assistant, double click on the function key to call back automatically. 4、EASY TO INSTALL AND WATER RESISTANT: This Bluetooth helmet headphone is suitable for full helmets, uncovered helmets, half helmets, ski, snowboard helmets. Simply connect the headset to the pre drilled headphone hole on your helmet to complete the installation. With IPX56 water resistant technology, it can cope with harsh weather conditions. 5、INSTALLATION TIP: Before purchasing, please check if your helmet has reserved space for helmet speakers. If there is space reserved, please connect the helmet speaker to your helmet via stick strap and place the wires behind the padding. If there is no reserved space, you may need to cut a hole in the helmet liner to install a motorcycle Bluetooth headset. Item Type: Helmet Bluetooth Headset Material: ABS Battery: Lithium Polymer Battery (Built in), Capacity: 180mAh Connection Method: Bluetooth 5.0, EDR Microphone Transmission Distance: ≤1m/3.3ft Standby Time: 160H Playback Time: 8H Charging Time: 1.5H 1 x Helmet Bluetooth Headset 1 x USB Cable 1 x User Manual