25W Aquarium Heater: The aquarium heater features a fully waterproof and submersible design to maintain the set temperature accurately and safely. Working power: 25W, size: 195mm x 25mm. The aquarium heater is suitable for small aquariums, recommended for aquariums up to 30 liters. Safe and Durable: This aquarium heater rod is made of 2mm thick quartz glass and double waterproof components, 33% thicker than normal 1.5mm aquarium heater glass, double sealing, explosion-proof, shatterproof and IP68 wash-proof. NOTE: When changing the water in the aquarium, turn off the power for ten minutes beforehand and then change the water. Adjustable Temperature: The adjustable temperature display range is from 20°C to 34°C (68°F to 93°F); The front of the heater features an easy-to-read temperature scale. The rotary knob on the top allows you to set the desired aquarium temperature on the scale. Accurate Temperature Regulation: The aquarium heater rod features a high-resistance heating wire and a