Thaikits Mosquito repeller 3VDC Unassembled circuit KIT for student / Education &lt;==Beware to Add To Cart !!! Only sold by Thaikits for product warrantee and free technical support==&gt; Require power supply 3VDC [ Not included the battery holder and bettery ] Current consumption 20mA PCB size : 1.6" x 1.39" Comes with the schematic