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 4LNickel 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 electricityApplication: It is specially designed for small fish tanks and does not occupy any space. Acid and , universal for fresh/seawater tanksAfter Tested: We are always committed to providing you with better products. We went through a very selection process from material to design.Name:Aquarium HeaterSpecifications:25W temperature control display USB versionApplicable scenarios:fish tank, aquariumNote: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:BlackMaterial:Plastic+MetalPackage Contents:1 * Aquarium HeaterOnly 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. szbym02