This tiny PCB measuring only 56(L) x 16W(mm) incorporates all the electronics for a 1 Watt amplifier. 6 to 9VDC operating voltage, 50mV input sensitivity, 8 ohm output and 20 to 25000Hz output frequency. Optional connection for a 10k ohm - 100K ohm logarithmic potentiometer (not included) for adjustable volume control. Build this kit in minutes! Kit supplied with PCB and all electronic components. Suitable power supply required extra (use MP-3146).