Feature: 1. Indicator Light: When first powered on, the aquarium heater enters the heating state, red light is on, wait for the water temperature to 26℃, green light is on, stop working. 2. Constant Temperature: Aquarium heater built in intelligent chip, when the water temperature is lower than 26℃, automatically maintain a constant temperature of 26℃. 3. Automatic Adjustment: Fish tank heater is within the normal temperature range, no need to manually adjust and control the temperature, simple and effortless. 4. Submersible Use: Compact fish tank heating rod, needs to be fully submerged for use, with strong suction cups for fixing, suitable for small fish tanks and turtle tanks. 5. Safe And Explosion Proof: Aquarium heater is made of explosion proof quartz material, safe, stable and durable, creating a comfortable living environment for your fish. Specification: Item Type: Aquarium Heater Material: Explosion Proof Quartz. Package List: 1 x Aquarium Heater Note: 1. Please use it under the specified voltage conditions, otherwise the product with a power of 25W will be damaged.2. This product is a special product for freshwater or seawater small fish tanks. Please use a voltage of 110‑ 50‑60Hz. Do not use it for other corrosive water or other heating, otherwise it will damage the normal use of the product.3. Please do not let non adults or people with abnormal body touch or use this product, otherwise it may cause unnecessary accidents to the product or fish tank.4. Please do not open the product or change the structure of the product in other ways, otherwise it may be an accident caused by the product or use.5. The product must be completely immersed in water, otherwise it will cause temperature control failure and accidents.