ITEM NAME:Mini Preamp Op Amp Module Amplifier Dual Channel NE5532 Preamplifier Tone B S6E2 Mini Preamp Op Amp Module Amplifier Dual Channel NE5532 Preamplifier Tone B S6E2 Name:NE5532 OP-AMP Board Channels: 2 (2.0) Working voltage: DC: 12V-30V Magnification :5 times Channel: Stereo Board size:50*30*15 mm Installation size:43*23mm Size: 36.4*35.5mm Color: Green Material: metal, PC Package Contents: 1 * Amplifier Board.1 Amplifier Board. Channels: 2 (2.0). Channel: Stereo. Color: Green.