The Audio ZK-1001U is a compact yet powerful Bluetooth 5.3 mono amplifier board built around the high-performance TPA3116D2 chip, delivering up to 100W of clean audio output. Designed for DIY enthusiasts, it supports a wide DC 9-24V power input range via a DC female 5.5x2.1 connector or terminal block, with an onboard booster circuit that can be set to 19V or 24V (factory default) to accommodate different speaker configurations. The board features dedicated treble and bass adjustment knobs for fine-tuned sound control, along with a volume knob for convenient level management. Connectivity options include Bluetooth 5.3 with low latency and AAC decoding, a USB port supporting MP3/WMA/WAV/FLAC/APE formats, and an AUX input. TWS (True Wireless Stereo) mode is also supported. The multifunction button allows play/pause, track skipping, and TWS mode toggling. An enlarged heat sink with adhesive backing ensures reliable thermal management. Mounting dimensions are approximately 4.55 x 2.17 inches, making it ideal for car audio, home speaker builds, and outdoor DIY projects.