Indicator Lights The heater uses indicator lights to show status. It will be red while heating and green when the target temperature is reached. External Touch Controller External controller with three touch buttons allows easy and safe temperature adjustment. The double digital display provides clear readings for quick reference. Over-temperature Protection After you set the desired temperature, the unit automatically switches off when the water reaches the preset temperature and turns back on when it drops below it. This provides safe and simple operation with automatic temperature management. Waterproof Performance The aquarium heater features a double seal design to prevent water ingress, providing high protection against electrical leakage in wet environments. Key benefits - Precise and reliable temperature control for aquarium water - Visible status indicators for easy monitoring - Safe and convenient external touch control with clear readings - Automatic safety shut-off and reactivation to maintain stable temps - Enhanced waterproof design with double seals to prevent leakage Compatibility and performance - Designed for aquarium use in standard home tanks - Simple, intuitive operation with minimal setup - Focused on safety and reliability in moist environments Use scenarios - Maintaining stable tropical temperatures in a community freshwater aquarium, especially in cooler rooms - Supporting fish during seasonal ambient temperature changes to reduce stress - Maintaining precise temperatures in quarantine or hospital tanks during treatment or recovery Notes - This description reflects indicator lights, external touch controller with three buttons, double digital display, over-temperature protection with automatic on/off, and a double seal waterproof design as the core features.