Digital amplifier 50 + 50W with Bluetooth and AUX - 5-27 V     Features Perfect HIFI sound: Adopt TPA3116D2 chip (with AM interference suppression function), with excellent sound quality. It guarantees that even with high-power operation for a long time, the THD is less than 0.1%. Mini but Powerful: 2-channel stereo output power 50watt * 2, working voltage range DC5-27V, for passive speakers 4-8 ohm, 50watt-200watt. Two inputs: supports 3.5mm wired input and Bluetooth 5.0 input. Bluetooth signal distance up to 14m. With volume control and power switch, ideal for your DIY passive speakers. Ensuring safety: this Bluetooth amplifier board has bottom and top plate, supports reverse link protection, over voltage protection, under voltage protection, overheat protection, short circuit protection. High power High audio quality: it is recommended to use a DC15V-24V power adapter with a current greater than 2A.