The CR123A Lithium 3 Volt battery offers up to 4 times the power of alkaline batteries. The 3 Volt Lithium CR 123A Battery is a high-rate 3 V lithium battery. It is used to power photo equipment, Streamlight and SureFire tactical lights and firearm lights.
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.