? Class D amplifier circuitry with low heat dissipation and strong power output. ? High-performance switching power circuit with high efficiency and low heat generation. ? It has five signal inputs (three microphones and two lines), with built-in Bluetooth, USB, and automatic playback functions. ? It has a 1.4-inch LCD dot matrix display screen with touch-sensitive function keys. ? The product features a master volume control function, with each channel's volume independently adjustable. It also has independent high and low tone adjustments. ? It has four LED-level displays that are dynamic and bright. ? With Output short circuit protection, DC protection, and high-temperature protection. ? It also includes 100V fixed voltage output and 8-16�� fixed impedance output. ? This product is suitable for small and medium-sized public broadcasting applications. ? Output Mode: 100V (21 ohms(��)) Constant voltage output