Features: The rechargeable helmet mount earphone, which does not squeeze the ears- and is more comfortable; The host includes a larger capacity battery, up to 450mAh, (built-in type is about 250mAh), making the standby time and working-time of the entire machine longer; Fix the host with screws and bayonets, making the host installation more tight and not easy to fall off during high-speed riding; The use of high-power audio power amplifiers allows for a wider range of audio volume, which does not affect music playback and phone answering in the noisy environment of high-speed riding; Using high-quality earphone chips, Bluetooth-compatible audio- can be restored with high audio-quality; Specifications: Size：approx 8.5x5x2cm/3.35x1.97x0.79in Color： Blue / Black Material: Plastic Battery: 450mA Bluetooth-compatible version: 5.0 Support protocol: A2DP AND AVRCP Charging-voltage/current: DC5V/190mA Frequency: 2.4GHz Power amplifier: HT4832SQ Working time: about 10 hours Mobile phone connection distance: 50meters Package Includes: 1PC Wireless Motorcycle Helmet Headset note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.