Description: SMALL FISH TANK HEATER 10W: Specially designed for small fish tanks less than 1 gallon, does not occupy the space of the fish tank, USB power supply, rated voltage DC 5V/2A. (A non 5V 2A adapter may cause the heater not to heat up, the numbers to flash, or to restart repeatedly.) INTELLIGENT AND PRECISE CONSTANT TEMPERATURE: Upgrade the chip, the accuracy is ±1°F, save more electricity bills. After setting the target temperature, the power is suddenly turned off, and the target temperature remains unchanged after turning on the power again. OVERHEATING PROTECTION: The fixed constant temperature is 26 degrees. When the water temperature is lower than 25 degrees, the red light is on for heating; when the water temperature is higher than 26 degrees, the green light is on for constant temperature; when the water temperature exceeds 36 degrees, the traffic lights flash alternately, and the over temperature alarms and stops heating; when leaving the water, less When the water is on, the yellow light flashes and the heating stops. EXTERNAL CONTROLLER: External temperature controller, no need to get your hands wet, no need to buy other controllers, easy to install, easy to control. WIDELY USED: Suitable for freshwater and saltwater. Specification: Material: Nickel Chrome Wire Size Chart: 2.8cmx12cm/1.10inchx4.72inch, Wire Length: 1.3m/51.18inch Package Includes: 1 Piece USB Aquarium Heater Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.