【Easy to Control】The temperature can be adjusted between 20 - 34 ℃ (68-93 ℉). Ensures that the fish also have a warm and comfortable environment in the cold winter. 【Safe and Practical】Maximum immersion depth of 120 cm in water, this product is only suitable for fresh water and salt water. Double waterproof protection, fully submersible design, can accurately maintain the set temperature. 【High Performance】Sensitive temperature regulator and overheating protection device, high resistance heating wire, uniform and stable heating, long service life. Good heat resistance, good insulation, high heat transfer efficiency, with strong support hook and suction cup, makes it more stable and reliable. 【With Suction Cup】With two strong rubber suction cups, strong suction, firmly attached, not easy to fall off. 【High Quality】Use explosion-proof quartz tube, reverse osmosis, anti-creep, explosion-proof, durable. Double sealing head, safe, leak-proof.