Description: USB heating rod, the temperature can be adjusted from 18-34 degrees, automatic power off when the temperature exceeds 36°C. Mini size, saving space in the fish tank and is more beautiful. Digital LED display, the adjustment accuracy is 0.5°C or 1°F, and the display accuracy is 0.1°C, simple operation. Made of nichrome wire, durable and safe. Suitable for fighting fish tanks, mini tanks, turtle tanks, horned frogs, pet drinking water, etc. Note: The product needs to be equipped with a 5V/2A adapter. Please ensure the voltage of the adapter, otherwise the product will not be heated. (Must be fast charge, 5V/2A) Specification: Material: Nichrome Wire Function Description: 1. Power-on state---When the power is first turned on, the heating rod temperature adjustment display shows 88.8, then the temperature adjustment display shows the last set temperature, and after 3 seconds, the heating rod shows the currently detected water temperature. 2. Temperature adjustment switch---short press the switch to adjust the temperature, the number on the temperature adjustment display flashes, and enter the temperature setting mode, the temperature adjustment display shows the last set temperature value, at this time, short press once to increase 0.5 degrees , the accumulative set temperature, the temperature range is 18--34 degrees cycle setting, the current set temperature value is automatically saved after 3 seconds of no key operation. Size Chart: Size: 5.5x2cm/2.17x0.79inch Package Includes: 1 Piece Fish Tank Heater Rod(4 pack) 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. 3. Wish you a wonderful on-line shopping!