Features:With a Large LCD screen: easy to read the temperature at a glance.Very precise: this thermometer is accurate enough to create readings within 0.1 degree. No sensor cable needed, simply attaches to the interior of your aquarium with the suction cup. High and low temperature automatic alarm: default high temperature 28, low temperature of 18. Wireless with integrated probe and waterproof design, perfect for fish tank or other place.Specification:Type: DC16Weight: Approx.34g/ 1.2ozSize: Approx.52 * 32 * 20mm/ 2 * 1.3 * 0.8inAccuracy: 0.1Temperature Range: 0-37/32-99Battery: 1.5V AG13 * 1 (Not Included)Package List:1 * Digital ThermometerNote:Please allow slight error due to manual measurement. Thanks for your understanding..