Feature: 1. REMOTE CONTROL: Detector alerts can be connected to WiFi and an app, so even if you're not home, you'll receive real time warning notifications when there's a leak or water seepage. 2. LOW BATTERY ALERT: When the sensor is low on power, the indicator light may flash once a minute and beep, indicating that the battery needs to be replaced as soon as possible (excluded). 3. COMPACT SIZE: Our compact size of this sensor is easy to install, and the installation does not take up space and is responsive. 4. WIDE APPLICATION: Sensors can be used in sump pumps, toilets, water heaters, washing machines, dishwashers, sinks, fish tank and anywhere else where water tends to leak and enter. 5. ABS MATERIAL: The sensor is made of smooth and insulated ABS material as the housing, smooth and burr free, which can be cleaned at a wipe. Specification: Item Type: Water Level Sensor Alarm Material: ABS Battery Type: LR03-1.5V 2 x AAA (without battery) Wireless Type: 2.4GHZ. Package List: 1 x Water Level Sensor Alarm3 x Installation Screw3 x Expansion Screw2 x Installation Sticker1 x Instruction