Specifications:In order to make riding safer and easier, B35 BT helmet headset is designed for remote operations for mobile phone calling stereo music playing and FM radio.The advanced CSR BT chipset and the intrgrated headphone amplifier inside B35 provide a better experience of phone calling and stereo music.Its delicate, small and water-proof design makes B35 be a good companion on your riding journey.Item Name: BT Helmet HeadsetMaterial: ABSBT Chipset Version: 4.1andEDR CSR8635BT profile:A2DP and ACRCPBattery Capacity: 450mAh (Included)Frequency: 2.4GHzAmplifier: HT4832SQCharging Voltage: DV 5VFeatures: Waterproof, Mini Size, Handfree to CallSize: Length: 8.5cm or 3.35" (Approx.)Width: 2cm or 1.97" (Approx.)Height: 5cm or 0.79" (Approx.)Notes:Due to the difference in the configuration of the light and the screen, the color of the item may be slightly different from the images.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Headset Host1 x MIC and Trumpets2 x Magic Tape Inside Helmet1 x Fixed Folder1 x Screw Driver2 x Screws1 x Charging Cable1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.