Features: 1.With novel appearance design, stable and reliable circuit, high quality material ensure the heat output, so that the water temperature in the aquarium remains stable. 2.Fully submerged, with power indicator light, support automatic temperature adjustment, double sealed waterproof design. 3.Stainless steel heater is only suitable for fresh water (sea water cannot be used); Glass heater is suitable for light and salt water. 4.6 kinds of power to choose from, suitable for different people's needs. 5.Come with 2 suction cups, easier to install. Specification: Item Type: Aquarium Heating Rod Material: Stainless Steel Color: As Pictures Shown Power VoltageFrequency LengthSuitable for Fish Tank 25W 220v~240v 50~60Hz 17.5cm/6.9in 20~30cm/7.9~11.8in 50W 220v~240v 50~60Hz 17.5cm/6.9in 30~40cm/11.8~15.7in 100W 220v~240v 50~60Hz 29cm/11.4in 40~60cm/15.7~23.6in 200W 220v~240v 50~60Hz 29cm/11.4in 60~80cm/23.6~31.5in 300W 220v~240v 50~60Hz 37cm/14.6in 80~100cm/31.5~39.4in 500W 220v~240v 50~60Hz 37cm/14.6in 100~120cm/39.4~47.2in PackageList: 1x Heating Rod2x Suction Cups Note： Cleaning and maintenance : 1. Pull the plug before cleaning 2. Dry the surface when not in use and store in a dry, clean place to avoid the sun 3. Do not heat in the state of no water, avoid contact with the heating tube to avoid burns.