100% brand new and high quality Feature: 2 original TPA3116D2 digital power amplifier chips,one of which is used as left and right channel power amplification,the other is connected with NE5532 front bridge to drive heavy bass. Small volume,high efficiency,high power, small heat generation and the like. NE5532 is a high performance and low noise dual operational amplifier integrated circuit.Similar to many standard operational amplifiers,it has the characteristics of better noise performance,excellent output driving ability,high small signal bandwidth,large power supply voltage range and so on. Therefore,it is very suitable for high quality and professional audio equipment, instruments,control circuits and telephone channel amplifiers. When used as audio amplification,the timbre is warm,high fidelity. Specification: Model:HW-302B Chip selection:NE5532x3+TPA3116D2x2 Operating voltage:recommended DC 24V (range 12-26V) Output power:80Wx2+100x1 (heavy bass) Output load:4-8 Ω horn Signal-to-noise ratio:100db Frequency range:14-100 kHz Channel number:3 channels (left + right channel + mega bass) Size:10.1x7x2.8cm/3.97x2.76x1.1in Packing weight:120g Note: General power supply and power amplifier should maintain a certain distance, to avoid electromagnetic interference. It is best to use a high quality power supply, the power supply will be stable. If you use a power supply such as a transformer, it is best to cover the transformer with a metal cover to prevent electromagnetic interference. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 0.5-3mm measuring deviation due to manual measurement. Package includes: 1 x Digital Amplifier Board 1Set x Screws