●Leak Protection from Water Damage - Automatically shuts off water when leak is detected from the water system. ●Can be used for all water systems such as reverse osmosis systems and water filter systems. ●Built-in Audible Alarm -This leak detector shuts off flow to the drinking water system in the event that a leak should occur. With an audible alarm and highly reliable design, this simple device provides better liability protection and can minimize water damage from a leak. ●Reusable - Unlike other one-time use leak detectors, this unit can be reset and reused. ●Easy Installation - Comes with 2 pcs x Quick Fitting 1/4"OD-1/2"BSP, 1 pc x 9V battery, 1 pc x instruction manual