The WS-1 is a low cost reliable water sensor that works on 12VDC alarm panels on a 24hr zone, open loop circuit. The wiring works similar to a two wire somke detector. When the terminals get wet from the water, the transistor flip flops and locks down to close the circuit. This causes the alarm panel to send an alarm.
The EK-TRG1640 is a 16.5VAC, 40VA Class II UL Encased Plug-in Transformer. Its features include built in cable strain relief and full surge protection. Its construction is a bright decorator white colored plastic. It comes with a mounting tab and mounting screw. The compact design, as well as its decorator color, makes it perfectly suitable for office or residential decors.