【FUNCTION】This aquarium heater can keep the heat emission and constant water temperature tank. Provide fish a comfortable living environment. 【ADJUSTABLE TEMPERATURE】Power indicator, it can adjust the temperature automatically, the temperature display scale can be adjusted between 20~34°C (68~93°F). 【DESIGN】Fully submersible and waterproof double insulation, with good sealing, can accurately maintain the set temperature and not short-circuit, durable and safe. Quartz glass tube with high temperature resistance, easy to set and read the temperature. 【SAFETY】Sensitive temperature controller and overheat protection device in the rod, explosion-proof and leak-proof, safe for your fish to use.