Metal material, wear-resistant, not easy to damage, anti-scalding surface treatment, explosion-proof and waterproof, durable. USB powered heating stick with USB charging port for easy portability and use anywhere. The compact mini design is suitable for all types of mini aquariums, suitable for aquariums up to 2.5L. This aquarium heater can be used at low water levels, and is small, low profile, and light to carry. Suitable for all types of mini tanks. Wide range of applications, suitable for aquariums, mini aquariums, turtle tanks, horned frogs, pet drinking water, etc. Specification: 5w Material: Aluminum alloy colour: As shown Package Contents: 1 x fish tank 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.