Amazingbuy&reg; - Vnetphone V1-2 New Bluetooth Interphone Motorbike Motorcycle Helmet Intercom Headset with Binaural speakers - for Helmet Use - Great for Riders & Skiers Stereo bluetooth headset,safe receiving phone call automatically Master bluetooth BC5 program,stereo music/audio function (phone) DSP noise cancellation function,DSP noise cancellation function Charging time is about 3 hours Standby time: 240 hours,More than 7 hours straight talk or listen to music