The heater has a timer function. You can set the time by pressing the SET button. When the time is up, the power will automatically turn off and an audible alarm will sound. Prevent accidents caused by forgetfulness. There is no need to leave the heater next to it during use, which is safer and more convenient. Submerge it in water to an appropriate level and plug it into any grounded wall outlet. Then the immersion heater can start working. With a high-quality stainless steel protective casing, the submersible heater will effectively prevent the heating elements from coming into direct contact with people or animals, and the heat is dissipated more quickly into the water by flowing through the holes in the casing. Durable and reusable. The holes on the casing dissipate heat more quickly into the water. 2500W can heat 5 gallons of water in minutes. To insert the heater, make sure the heater is completely submerged in the water and then connect the 220V power supply. Easy operation: Submerge the heater to the water level (the heater has a safe water level line). Plug into any grounded wall outlet. Check the power indicator in the outlet to ensure the bucket heater is powered on, then the portable heater will start to work. Warning: The power cord and handle must not be submerged in water.