This float switch from PMD Way is ideal for detecting changes in water levels in a vessel. For example, by mounting it in the bottom facing up, your system will know when the tank is almost empty - or by mounting at at the top facing down, the system will know when the tank is full or almost full. Inside the spine of the switch is a reed switch, which is activated by a magnet inside the floating ring. There is no mercury in the unit so it is safe for fresh or saltwater tanks. A pair of pre-tinned 35 cm wires are prefitted to the switch. The switch is not designed for directly switching mains current, instead consider it as a replacement for a simple low voltage, low current push button. We are obliged to mention that this is not a "food grade" product. Sold in packs of five. Specifications: Maximum current through switch - 1.5A Maximum voltage through switch - 220V DC/200V AC Temperature rating: -10~85 degrees Celsius Dimensions: Don't forget to check out our full range of switches if this doesn't meet your needs. And as always, all orders receive free delivery. And remember ... if you: can't find what you need not sure what to order want a bulk deal need technical support or just want to have a talk ... Please email us via [email protected]. To keep up to date with new products, news, tutorials and more - we're on x, Facebook, Instagram, threads, reddit, and instructables.