2-Pack ZK-1001U Bluetooth 5.3 Mono Amplifier Board with TWS and Boost Circuit, Mini Audio Amplifier for Home Outdoor DIY Speakers with 100W Power Output, Treble and Bass, USB/AUX/BT Input, DC 9-24V

_ [ZK-1001U Mono Amplifier Board] ZK-1001U Mini Bluetooth Audio Amplifier Board is a mono amplifier rated at 100W, can only touch passive speakers (20-100W, 3-8), DC7-24V/4A or more (can't be connected to AC, suitable for batteries such as 7.4V /12V/21V, not suitable for 24V batteries). This mono amplifier adopts TPA3116D2 chip, the distortion rate is less than 0.3 %, upgraded Bluetooth 5.3 chip supports AAC decoding, APP and TWS, low latency
_ [Outdoor Speaker Amplifier with Boost] Built-in Boosting Circuit for Optimal Voltage Output With Auto Boosting Circuit, it can intelligently adjust the input voltage (9V/15V) to a stable 19V or 24V (Default) Red switch 1 is 24V and ON is 19V), this flexible voltage is ideal for outdoor battery-powered speakers.
_ [TWS BOX Function] ZK-1001U 2-piece set, as a mono amplifier, this amplifier module supports TWS BOX mode, which for ZK-1001U mono amplifier, you can use these two independent Bluetooth amplifier boards to connect via TWS box function and rea