This is Liquid Water Level Sensor Horizontal Float Switch. It is made of high quality and durable material for long time use. Good choice for you.                                    Features            Use them with hydroponics， saltwater tank， freshwater tank， gardening， aquariums for power head control， pet bowls， fish tanks， filtration， heating， or what ever your project may beUp float switchContains no mercury                                                            Specifications            Cable Length    12"    <br>Maximum Load    50 W    <br>Max Switching Voltage    250V DC    <br>Minimum Voltage    100V DC    <br>Maximum Switching Current    0.5A    <br>Max Load Current    1.0A    <br>Max Contact Resistance    0.4Ω    <br>Temp Rating    -20 ~ +80℃     Net Weight    10g    <br>Product Number    FS-1B-31    <br>                                                            Package Includes            2x Liquid Water Level Sensor Horizontal Float Switch