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Can be connected to any passive 4/8Ω speaker and be Compatible with standard audio cable for sound system. Ultra small size (64 x 45 x 17mm ) and two layers of 2.0 Ah PCB board design, light wight and easy to install. Adopts large filter capacitor (2 pieces 2200UF/16V) and TA2024 chip. With short-circuit and over-temperature protection. It is better to use regulated power supply and the power supply should be DC 12V/above 3A. Positive and negative cannot be reversed.