Poles (Mono / TS), Switched T Pole (Normalling) Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)Small Signal NPN Transistor, TO-92 KK254 Molex header 2.54 mm spacing D Switch, three position, single pole double throw K switch normally-open pushbutton push-button LED D MEC 5E single pole double throw, center OFF position K switch sp3t ON-ON-ON D Switch, single pole normally-open.