The single-use time exceeds 40 hours, eliminating the worry of running out of power and anxiety about electricity use. Metal diaphragm for an auditory feast Enjoy the auditory feast with metal diaphragm. DVR recording function Clear images without worries. Special Features:DVR Video,Voice control,Universal Pairing Function,Waterproof,Noise Reduction,Bluetooth Motorcycle Applicable Helmet Type:Half Helmet,MODULAR,MOTOCROSS,Open face,Full Face,Flip Up Helmet,Universal Model Name:Bluetooth Motorcycle Helmet Intercom Connection Mode:bluetooth (The product appearance and printed words depending on the batch, but this does not affect use) Color: As shown Material: ABS Package Contents: 1 x Motorcycle Bluetooth FM Interphone Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.