LEXIN S3 Motorcycle bluetooth speakers with FM Radio External antenna, Weatherproof Motorcycle audio systems with USB port for charging fit 7/8'' to 1.25'' Handlebar, Two 3 Inch Chrome Speakers Finally, an all-weather bullet shape bar-mount speaker system with extremely loud volume that provides premium sound. 3 stereo speakers include built-in Bluetooth A2DP stereo, USB, and an FM radio tuner, with a 50-watt power amplifier. Stream stereo music wirelessly from any Bluetooth-enabled device or USB audio source. Easy installation, just pair or plug to play. Mounting Hole Size:7/8"-1.25''.USB for MP3/WMA/WAV Music Stream. Waterproof Design, Handles All Weather Conditions. New Metallic Housing With Polish Chrome Treatment, Fit Excellent With Your Bike. Bluetooth A2DP Wireless Stereo System For Biking, Cycling And Racing - Max Speed: 80 Mph Bluetooth v4.0 connectivity to listen to music direct from your mobile phone of BT enabled music player using the A2DP profile.