ITEM NAME:5X(Mini Preamp Op Amp Module Amplifier Dual Channel NE5532 Preamplifier To T5B7) 5X(Mini Preamp Op Amp Module Amplifier Dual Channel NE5532 Preamplifier To T5B7) 5X(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. Size: 36.4 35.5mm.