<ul><li>115 Volt - 9V battery back-up</li><li>Compact probe mounted sensor (snaps on 1-1/4\" or 1-1/2\" discharge pipe)</li><li>Auxiliary contacts - Visual and audio alarm</li></ul><br><br>Product Description\n\nIndoor 115v alarm with 9v battery back-up. Compact probe mounted sensor, auxiliary contacts with visual and audio alarm.\n\nFrom the Manufacturer\n\nIndoor 115v alarm with 9v battery back-up. Compact probe mounted sensor, auxiliary contacts with visual and audio alarm.

Liberty Pumps ALM-P1 Indoor High Liquid Level Alarm with Probe Sensor