Finally, you can retrofit your battery back-up system with a high-water alarm that will run off your battery. Monitor your pump or Septic Level from afar. Sump Alarm indicates visually and audibly when a pump is not operating as it should by monitoring the water level and sounding an alarm when a high water or pump failure situation occurs. The large (1 inch) LED indicator lights are visible from hundreds of feet away. When a high-level alarm condition exists, flashing red light and 90db horn become active. A 1" white LED pilot light indicates that power is on the unit. Place the float, mount the head unit, plug in the unit, and the installation is complete. - Has (4) rear mounting holes for customer mounting. - Includes wall anchors for head unit, zip ties for floats, and instructions. - Mercury Free Float Switch is Rated for 1,000,000 operations, suitable for use with potable water. - It can be used in sump pumps, water tanks, lift stations, low density oils and sewage water - Unit is wired for high level alarm, but can be reversed for low level alarm - 110 Volt Units have standard 110 Plug; 220 Volt units have pigtail ends