1、Safe to use: Anti-scald surface treatment, which is explosion-proof and waterproof, durable and anti-cracking. 2、Built-in chip, automatic 25℃ temperature controller. 3、Mini design: suitable for all types of mini fish tank: 15w is fit for 10L and below aquarium, while 25w is fit for 20L or below aquarium. 4、Save time and energy: high efficient of automatic constant temperature heating. Suitable for fish tank, low water level fish tank and pvc fish tank. 5、With temperature sensing probe, over temperature induction, it will power off when it is away from water. Features: 1. Safe to use: Anti-scald surface treatment, which is explosion-proof and waterproof, durable and anti-cracking. 2. Built-in chip, automatic 25℃ temperature controller. 3. Mini design: suitable for all types of mini fish tank: 15w is fit for 10L and below aquarium, while 25w is fit for 20L or below aquarium. 4. Save time and energy: high efficient of automatic constant temperature heating. Suitable for fish tank, low water level fish tank and pvc fish tank. 5. With temperature sensing probe, over temperature induction, it will power off when it is away from water. Specification: Condition:100% Brand New Material: plastic Color: As Pictures Shown Size: approx.23*16*135mm/0.9*0.6*5.3in Weight: Approx.152-156g Package list: 1 * Turtle Tank Heating Rod Note: The heating rod must be completely placed in the water. There must not be any part exposed in air, otherwise the temperature detection will be out of control, resulting in continuous heating.