Size:25W suit for 3-5 Gallon Why Betta Need This Heater? Ideally, the water temp should be at least 78℉ for a Betta. They are often kept in small tanks or bowls, thus heating can be a challenge. Changes in room temperature, especially in climates that become much colder at night, can prove stressful for a Betta. Fully Submersible The Betta Tank Heater is fully submersible in water and has a LED indicator which turns red while heating and it will keep the water temperature between 77℉ - 82℉ / 25℃ - 28 ℃ (±1℃). Preset Temperature Preset temperature is 77° F (25° C) (±1℃). Note! 1.The aquarium heater is designed to work under water only, please DO NOT turn it on when it's outside water, as dry burning might lead to malfunction. 2.Please don't put the fish tank heater into your tank once the wire or heater damaged. 3.When there is a heater in the fish tank, do not put your hands into the water. Specifications: Size: 5.3 x 1 x 0.7in / 13.5 x 2.5 x 1.7cm
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