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Supply voltage: DC 1.8-12V; Output Power: 1.5W(0.2W-5W Horn) Input Interface: 3.5mm Audio input; Load type:4-32 Ohms With volume control potentiometer, convenient for user to adjust volume Size:52 x 32 x 23mm / 2.04 x 1.26 x 0.9inch(LxWxH) Package Content:2 x TDA2822M Audio Amplifier Module, 1 x 3.5mm Audio Jack Cable