SIMPLE DESIGN - The Aquarium Thermometer is an attractive yet simple unit to design with no overly complicated controls. The unit itself is blue with a clear plastic border around the edges. WATERPROOF - The aquarium thermometer is completely waterproof, you can put it in the aquarium, real-time monitoring water temperature VERY SIMPLE TO USE - No instructions needed. It’s the easiest aquarium thermometer on the market with no buttons to use. SUCTION MAT FOR EASY PLACEMENT - Just find the best spot in the fish tank , then secure the device using the small suction cup that will hold the thermometer in place until it needs to be removed. WIDE RANGE - Temperature range is -58°F to 158°F, allowing you to use this aquarium thermometer in most temperature conditions.