Features: brand new and high quality Bluetooth-compatible 5.0 provides instant pairing and stable transmission without interruptions. The advanced CSR bluetooth-compatible chip and the embedded headphone amplifier provide a better phone call and stereo experience. It's delicate, compact and waterproof design makes it a good companion for your cycling trip. IP54 water resistant,allows for universal pairing. Suitable for most types of motorcycle helmet. Specifications: Material:ABS Color:Black Size:8.5x5cm/3.35x1.97in Bluetooth-compatible Version: 5.0 CSR8635 Battery Capacity:450mAh Working Time:About 10Hours FM:Support Charge Voltage/Current: for DC 5V/190mA Frequency: 2.4GHz Amplifier: HT4832SQ hone Connection Distance: 50m Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Headset 1x MIC 2x Nylon-button Inside Helmet 1x Fixed Folder 1x Screw Driver 2x Screws 1x Charging Cable 1x User Manual