3. Switches 9 & 10 (7) are for the zone/channel setting on the transmitter. The four zones are as follows: Switch 9 Switch 10 Channel Tune ON ON 1+12VDC Classical OFF ON 2 Westminster ON OFF 3 Ding Dong OFF OFF 4 Whistle TONE, RELAY AND VOLTAGE OUTPUT 1. Each of the four transmitter zones (selectable by switch 9 & 10) will sound a tone and activate the corresponding relay on the receiver. 2. Each of the form “C” relays is rated for 24 VDC at 3 Amp maximum current. 3. The 12 VDC output will activ