About this item MONO AMPLIFIER BOARDThis mini Bluetooth audio amplifier board is a mono channel amp with 100W rated power, designed for use with a passive speaker (20-100W, 3-8), and requires a power supply of DC7-24V/4A above (not suitable for AC; compatible with 7.4V/12V/21V batteries, but not 24V batteries). This amplifier features a TPA3116D2 chip, with a distortion rate below 0.3%, and upgraded Bluetooth 5.3 chips that support AAC decoding, APP and TWS, ensuring low latency. Outdoor Speaker Amplifier with BoostEquipped with a built-in boost circuit for optimal voltage output, this amplifier features an auto-boosting circuit that intelligently adjusts input voltage (9V/15V) to a stable 19V or 24V (default: 24V). This flexible power supply is ideal for outdoor use with battery-powered speakers. TWS BOX FUNCTIONThis amplifier supports TWS BOX mode, allowing two independent Bluetooth power amplifier boards to be connected by TWS box functionality, achieving left and right channel ster