The EK3 is suitable for indoor applications, attached to small conditioners up to 40mm.
The EK3 is water resistant but not waterproof. It is not recommended if water is pumped into a water storage tank.
The EK3 is powered by 2 “D” cell batteries and delivers 2mA @ 3V. The batteries should be replaced every 12 months or when the L.E.D light goes out.