Microlab H21 Bluetooth Wireless 2.0 Two-Way Bookshelf Speaker System w/ USB Charging port and wooden cabinets with leather finishing Amplifier: 36 Watt Output Power, 2x 18 Watt RMS Distribution, 50 Hz - 20 kHz Frequency Range Speakers: 1-Inch Tweeter Drive Unit, 3.5-Inch Woofer Drive Unit Interfaces: 2RCA (input), Terminal binding post (output) Bluetooth Speaker with CSR latest Bluetooth chipset solution Wooden cabinets and leather finishing