Real-Time Supervision: APP can display the current water level. Turn on/off equipment (relay 1) remotely via App. Users can also control it on/off by manual switch button SW1, SW2. Two relay outputs: Relay 1 control water level. Preset 'Add water' or 'Pump water' working mode, can auto turn on/off relay 1 when it reaches to the preset water level value. Set upper and lower limit value of water level alarm via APP, real-time push alarm notification to user's smartphone. Can set relay 1 running or delay working time. Provide a complete SMS command table that allows users to control devices via SMS without relying on a network or app. *Size of controller: 70mm x 87mm x 60mm *Power voltage: DC output 12V *Power consumption: less than 2W *Limited running time of relay output 1: 0 to 1000 minutes settable via WLTE App Color: Black Material: plastic Package Contents: 1*Water Level Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.