9v battery included, and cheap to purchase overlooked other products requiring lithium batteries.
Quite loud alarm
less:
large spacing between the detection of legs and requiring a good layer of water
A little too much housing in height to fit under a cabinet in my setup and for my use.
So in the current position, it will detect only large leaks, which are spread on the floor, I would have appreciated having more sensitivity.
Aside from that, it's a good product.