Wirelessy control audio with the Click. Connects to a single smartphone with Bluetooth Low Energy. Control music for play/pause next track and volume. Accept or reject phone calls. Easy mount design with adjustable silicon strap. Mount to to steering wheels bicycle handlebars and more. Charge free and low power consumption. IPX5 Waterproof - no worries about rain or moisture. Runs on 3V CR2032 battery (included). Frequency range: 2.402-2.480GHz. Dimensions: 5.86" x 1.53" x 1.57".