Features Easy to use: no sensor wire is needed, simply connect to the inside of your aquarium with the suction cup. HIGHLY ACCURATE - This thermometer is accurate enough to create readings within 0.1 degrees. Wireless Design: Wireless with built-in probe and waterproof design, perfect for fish tank or other place. Automatic high and low temperature alarm: default high temperature 28℃, low temperature 18℃. With a large LCD display: easy to read the temperature at a glance. Features: Very accurate - this thermometer is accurate enough to create readings within 0.1 degrees. High and low temperature automatic alarm: default high temperature of 28°C, low temperature of 18°C. No sensor cable is needed, it just connects to the interior of your aquarium with the suction cup. With a large LCD display: easy to read the temperature at a glance. Wireless with built-in probe and waterproof design, perfect for fish tank or other place. Specification: Type: DC16 Weight: approx. 34 g/1.2 oz Size: approx. 52 x 32 x 20 mm/2 x 1.3 x 0.8 inches Accuracy: ±0.1°C Temperature range: 0℃-37℃/32℉-99℉ Battery: 1.5V AG13*1 (Not Included) Package List: 1 x Digital Thermometer Note: Please allow a small error due to manual measurement. Thank you for your understanding. Package List