Check the listing for details. Liquid Level Controller Electronic Kit - Velleman K2639 - NEW. Condition: New. Listed at 27.99 USD. Liquid Level Controller Electronic Kit - Velleman K2639 - NEWVelleman Liquid Level Controller (K2639)Make:VellemanModel:K2639UPC:816353010821EAN:5410329026394Brand NewBrand NewOriginal retail packaging DescriptionForgotten to turn off the tap, leaking washing machines, water level dropping in your aquarium, rain tank or water tank suddenly dry or over flowing, water in your cellar, etc. Such situations are often the cause of trouble and financial burden. Prevention is better than cure. So use this fluid detector. This multifunctional device is easy to use in a variety of applications - 1) LED control of set fluid level - LOW, MIDDLE, HIGH , 2) Controller - the relay automatically switches a pump and/or valve to keep the fluid level between the LOW and HIGH marks , 3) Alarm - if the sensor detects a level which is too high or too low (selectable), the relay will operate a bell or other alarm device.Featurespower supply - 12-14V AC or 16-18V DC / 100mARelay output - 240V / 3A max.Dimensions - controller PCB - 4.1 x 2.4" sensor PCB - 4.1 x 1You can substitute your own sensor probesSpecsRelay output: 240V / 3A max.power supply: 12-14V ACsensor PCB: 104 x 25mm / 4.1 x 1"controller PCB: 104 x 60mm / 4.1 x 2.4"