Grace Digital GDI-BTSP207 Powered Bookshelf aptX Bluetooth Speakers (Red, Pair) Stream music wirelessly via Bluetooth from any Bluetooth-enabled device Integrated RCA audio inputs to connect optional wired home audio devices such as iPods, cd players and TV's as an optional audio source Delivers sound with striking accuracy with our world-class acoustic tuning and modeling. Supports universal Bluetooth protocol SBC as well as CD audio quality apt-X Volume, playback, audio source controls, and Bluetooth connect button are conveniently placed on the top of the left speaker Bluetooth version 4.0, 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