【Easy to Control】The temperature can be adjusted between 20 - 34 ℃ (68-93 ℉). Ensure that the fish also have a warm and comfortable environment during the cold winter. 【Safe and Convenient】Maximum submersible depth of 120 cm working environment, this product is only suitable for fresh water and sea water. Double waterproof protection, fully submersible design, can accurately maintain the set temperature. 【High Performance】Sensitive temperature control and overheating protection, high-resistance heating wire, even and stable heating, long service life. Good heat resistance, good insulation, high heat transfer efficiency, with strong supporting hook and suction cup, making it more stable and reliable. 【With Suction Cup】With two strong rubber suction cups, strong suction, firmly fixed, 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.