Microlab M102 Daisy-Chain Multi-Color Compact Mini Stereo Speaker Daisy-chain MD102 or more for better sound effects Output Power: 1 Watt RMS Power Distribution: 2x 1 Watt RMS Speakers: 2x 2-Inch Driver Type, 2x 2 Watt, 4 Ohm Rated Power Interface: 3.5 mm Earphones(output), 3.5 mm Stereo Plug, Mini-USB(input)