Item Name: Mini USB Aquarium Fish Tank Thermostat Heate Heater Heating Rod LED Display. Tank capacity: 3LSize: As showUSB adapter: 5V2ASpecification:Material: Nichrome WireAdjustable temperature: 18-34 degreesPower cord length: 136CM (Approx)Describe:- USB heating rod, the temperature is adjustable from 18-34C, and it will automatically power off when it exceeds 36C.- Mini size, save aquarium space, more beautiful.- Digital LED display, the adjustment accuracy is 0.5C or 1F, the display accuracy is 0.1C, and the operation is simple.- Made of Nichrome wire, durable and safe.- Suitable for fish tank, mini tank, turtle tank, horned frog, pet drinking water, etc. Reminder: The product needs to be equipped with a 5V/2A adapter. Please make sure the voltage of the adapter, otherwise the product will not heat up. (Must charge fast, 5V/2A) Function Description:- Power-on state---When the power is turned on for the first time, 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. - Temperature adjustment switch---short press the switch to adjust the temperature, the number on the temperature adjustment display flashes, 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, Accumulated set temperature, the temperature range is 18--34 degrees cycle setting, the current set temperature value is automatically saved after 3 seconds of keyless operation. Package includes:1 piece fish tank heater Notes:1. Due to manual measurement, please allow a slight error.2. Due to the difference of different monitors, the picture may not reflect the actual color of the item. *Please make