Usage Tips:Temperature adjustable: USB micro-type cylinder heating rod for precise temperature control The temperature is set between 18-34, accurate to 0.1 degrees to give the desired temperature for fish. Compact: As small as a thumb, it does not take up space and is suitable for mini fish tanks and micro-tanks with a water capacity of up to 4L Nickel soldering electric heating wire: a type of nickel soldering electric heating wire, filled with sand to surround and heat up, fully converting heat energy, quickly accumulating energy and saving electricity Application: It is specially designed for small fish tanks and does not occupy any space. Acid and , universal for fresh/seawater tanks After Tested: We are always committed to providing you with better products. We went through a very selection process from material to design. Name:Aquarium Heater Specifications:25W temperature control display USB version Applicable scenarios:fish tank, aquarium Note:Due to different production batches, there are differences in printed labels, and there are some differences between the physical object and the picture, which does not affect normal use. Colour:Black Material:Plastic+Metal Package Contents: 1 * Aquarium Heater Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.