Note on 31st Oct 2012 : To enhance the convenience of users, we have includes the source selection rotary switch from now on. This is a kit of an audio source selecting circuit. The circuit allows four stereo channels to be switched by a rotary switch. High quality relays are used for switching to minimize the length of signal path. The kit includes connector and extension cable to a rotary switch, the rotary switch is also included. LEDs are used to indicate the active channels. It only need a AC 12V input to function. PCB dimension : 14cm x 5.1cm. Board thickness : 1.6mm. We do air shipping worldwide at US$6.50. We welcome combine shipping. Powered by SoldEazy