• NETONDA 50W aquarium heater, submersible design. • Maintains the set temperature precisely and safely. • Dimensions: 250 mm x 25 mm. • 2 mm quartz glass, 33% thicker than normal glass. • Double sealed layer, waterproof IP68, explosion-proof. • Adjustable temperature range: 20°C to 34°C. • Easy-to-read temperature scale on the front. • Built-in aquarium thermostat, error of +/- 2°C. • "ON" indicator lamp to verify operation. • Provides a safe and healthy environment for fish. • Easy installation with 2 powerful suction cups. • Compatible with freshwater and saltwater aquariums.