Self-contained unit that hooks over the side of a container and is about the size of a matchbox.
Ideal for fish tanks, water features and even to allow a blind person to pour water into a cup without overflowing.
You can even lay it on the floor to detect flooding.
Originally designed by Dixi Online at the request of an aquarium shop.
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Uses a standard gate remote control battery (23A)
Battery life is about the same as shelf life of battery as it uses no power at all when not in alarm state.