Features: brand new and high quality Temperature range: 62.6°F to 92.2°F (17℃-34℃), display Fahrenheit °F. Multi Options: We offer heaters with 4 different powers. 25 watt is designed for 1~15 gallons for tank. 50 watt is for 15~30 gallons for tank. 75 watt is for 30~45 gallons for tank. 100 watt is for 45~75 gallons for tank. Automatic constant temperature function: When water temperature reaches to specified temperature value, our aquarium heater will automatically stop heating; When water temperature is lower than the set temperature, the heater will automatically start heating. External button: Cyclic adjust temperature , easy to use and Safety. Note: This heater is submersible use only, during its heating for time, heater must be submerged into the water. Specifications: Material: ABS Color: Black Power: 25W/50W/75W/100W Size: Approx.7x2x11cm/2.76x0.79x4.33in Weight: Approx.225g Voltage: 110V Temperature Adjustable Range: 17℃ - 34℃/62.6°F - 92.2°F Wire Length: 1.1meter/3.6ft Package Includes: 1 x Mini Aquarium Heater (25W/50W/75W/100W) 2 x Suction Cup note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!