Logitech UE Boom 2 Phantom Black Portable Bluetooth Wireless Speaker Specification: Maximum Sound Level: 90dBA Frequency Range: 90Hz - 20kHz Drivers: two 45mm (1 3/4) active drivers and two 45mm x 80mm (1 3/4 x 3) Dimensions: Diameter: 67mm or 2 3/4 inches. Height: 180mm or 7 1/8 inches. Weight: 548g or 1.2lbs.