Two Source, 6.5", Amplified Drop Ceiling Speaker with Bluetooth on a 2X2 tile and backcan assembly delivers up to 40 watts power directly to the speaker. Each powered speaker (2X2AMP-BT2S61) can drive three additional speakers (2X2IC6NA). One line can drive up to 10 self-amplified speakers. Lower noise feature and protection from shorts and overheating. 15 Volt DC Level 5 power supply and Volume Control included. Built onto the OWI IC6 In-Ceiling Speakers on a 2X2 Tile and backcan assembly 2 Line Level Input/Sources Up to 40 Watts of Power - right at the speaker With Priority Override Feature With Built-in Stereo Combiner Balanced Line level Output Bluetooth Features With a 3.5 mm Stereo Jack Line Input 15 Volt DC power supply (UL Listed-Level 5) included Protected from shorts and overheating Lower Noise Feature Fast and easy - install in the field Stereo/mono volume control included