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.<br> 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<br> Nickel soldering electric heating wire: a new type of nickel soldering electric heating wire, filled with black gold sand to surround and heat up, fully converting heat energy, quickly accumulating energy and saving electricity<br> Application: It is specially designed for small fish tanks and does not occupy any space. Acid and alkali resistant, universal for fresh/seawater tanks<br> After Tested: We are always committed to providing you with better products. We went through a very strict selection process from material to design.<br> <br> Name:Aquarium Heater<br> Specifications:25W temperature control display USB version<br> Applicable scenarios:fish tank, aquarium<br> 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.<br> Colour:Black<br> Material:Plastic+Metal<br> <br> Package Contents:<br> 1 * Aquarium Heater<br> <br> Only the above package content, other products are not included.<br> 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.