Features: 1. Mini Size: The compact design helps save space and is easy to hide, offering full heating performance without taking up much room. 2. Precise and Constant Temperature: Built-in intelligent IC chip monitors water temperature. The heater automatically turns on when the water temperature falls below the set point and turns off when the desired temperature is reached. 3. External Temperature Controller: Adjustable temperature range from 18°C to 34°C. The external controller can be mounted on the outside edge of the tank, allowing convenient and safe temperature adjustments without reaching into the water. 4. Memory Function: The thermostat retains the last temperature setting. In the event of a power interruption, the heater will resume operation using the previous settings once power is restored. 5. Multiple Use: Suitable for both freshwater and saltwater aquariums. Can be used in fish tanks, turtle enclosures, pet fountains, and for plant propagation. Specification: Material: Quartz Glass Product Color: Black Product Size: 15.5 x 8.5 x 5.5 cm Product Weight: 119 g Power: 10 W Temperature Control Range: 18°C - 34°C Control Accuracy: ±0.5°C Package Included: 1 x Small Aquarium Heater