Product name:NE5532 preamp tone board Using NE5532 chip, it can replace 0P275, AD828, NJM4558, TL072 and other general-purpose dual operational amplifiers. Working voltage: DC9-24V (5.0x2.1 MM core input, 2P seat input) Output power: rated power 2x770mW stereo (24V/32 ohm) Can be connected to loads above 32 ohms Output mode:3.5mm audio terminal Input mode:3.5mm audio terminal, 3P_2. 54mm terminal block, 6P_2. 5mm seat Signal to noise ratio:98db Total harmonic distortion plus noise:Less than 0.01% Frequency response:20-20khz Low quiescent current/noise suppression Bass:100hz/8db gain Treble:10khz/8db gain PCB:72x53mm Color:As Shown Material:Acrylic + electronic components Package Contents: 1 * tuning board module 1set * acrylic shell accessories 1 * Instruction Manual in Chinese and English Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.