Specifications: It is small, light weight and easy to carry. With the latest V4.2 + EDR Bluetooth technology, the earphone has excellent signal transmission, ultra-low power consumption. The headset supports all Bluetooth devices, support automatic answering function, switchable manual answering phone function, safe and fast. Built-in high-quality anti-jamming microphone effectively realize hands-free answer and hang up. It features high-fidelity sound, and support the last or next song function, volume increase and decrease, playback/pause, automatic callback and other functions, with simple operation. Item Name: Motorcycle Helmet Headset Bluetooth: V4.2 + EDR Transmission Range: about 10m (the transmission distance is different due to environmental factors and mobile phone Bluetooth devices) Frequency Range: 2.4026-2.480GHz Battery: Built-in 3.7V 500mAh Battery (Included) Charging Time: about 4-5h Standby Time: about 180h Continuous Working Time: about 32h Features: Hands-free, Earphone, Easy to Install Size: 24cm x 13.8cm x 3.5cm/9.45" x 5.43" x 1.37" (Approx.) Notes: Due to the light and screen setting difference, the item's colour may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Motorcycle Helmet Headset 1 x USB Cable 1 x User Manual 2 x Magic Tape