Condenser Microphone Kit with Pre-Amp [ Unassembled version ] 9VDC [FK648] &lt;==Beware to Add To Cart !!! Only sold by Thaikits for product warrantee and free technical support. Requires 9 VDC / Free 9V battery connector only sold by Thaikits Current Consumption : 5mA.max Comes with the schematic diagram PCB size : 0.67 x 1.50 inches