Accessories: wire length 5 feet.equipped with 2 powerful suction cups, so that the heating rod can be firmly fixed in the fish tank. Cautions: 1.Aquarium Heater temperature should be adjusted according to the actual room temperature of the fish tank. 2.When the device is in use, the fish tank heater must be completely immersed in water to avoid dry burning damage to the aquarium heater. Place the heater bar vertically or horizontally in the aquarium to make the indicator light as clear as possible. Then plug in the power cord and the indicator lights up to indicate that it is working. 3. Please clean the heater regularly and keep it in good working condition. 4.When you need to remove the heater from the water, first unplug the power cord and carefully remove it after cooling.