Venstar Cycling Wireless Speaker Stereo Portable Bluetooth 4.0 Subwoofer 2100mAh Battery w/ Remote Controller for Outdoor Sport Hiking Climbing Riding Running Driving, Waterproof Dustproof Shockproof Multifunctional mount installed on bike handle or frame, can hold speaker or water bottle. Better hands-free by high sensitive MIC. Two optional of electronic bells, save bike handle space and money. Long life battery: 2100mAh satisfy better driving. i-Free Intergrated drive-by-wire makes drive easier to enjoy safety and freedom. Connect Bluetooth automatically, Bluetooth function can run in background. BAS technology makes better balance between loudspeaker and IC and power circus, more perfect sound quality. FM radio with built-in antenna, clear radio even in week signal environment. breakpoint memory for FM station, saved automatically.