Easy and safe refilling of evaporated water in the aquarium   – Permanent monitoring of the water level in the aquarium with an infrared sensor incl. delay circuit. – Automatic refilling of evaporated aquarium water. – Adjustable minimum and maximum water levels in the aquarium or filter sump. – Dry-running protection of the refilling pump – optical and acoustic alarm. – There is a warning for low water level of the refill tank. – Easy installation and maintenance, plug connections on all cables (incl. cable protection against unintentional release). – Safety shutdown circuit in case of a defective level sensor. – 12 V low voltage, incl. transformer 100 – 240 V / 50 – 60 Hz.