Material: stainless steel Voltage: 220V Frequency: 50/60HZ Temperature Range: 20~34℃ / 68~93°F Cable Length: Approx. 120-150cm Plug: Us / EU Plug size: 50W: length 19cm / ", wire length 120cm /", voltage 220V, Hz 50-60Hz, temperature control range: 18-34 ℃ 100W: length 23cm / ", wire length 120cm /", voltage 220V, Hz 50-60Hz, temperature control range: 18-34 ℃ 200W: length 28cm / ", wire length 120cm /", voltage 220V, Hz 50-60Hz, temperature control range: 18-34 ℃ 300W: length 32cm / ", wire length 150cm /", voltage 220V, Hz 50-60Hz, temperature control range: 18-34 ℃ 500W: length 37cm / ", wire length 150cm /", voltage 220V, Hz 50-60Hz, temperature control range: 18-34 ℃ Instructions for use: 1. Temperature control range of heating rod: 18-34 ℃ 2. Voltage: European standard 220 v-240 V, American standard 110 v-120 V, 50 Hz / 60 Hz 3. When the light is on, it means that it is heating. 4. When the heating rod is working, it is recommended to install a water circulation system to make the temperature of the fish tank reach a better balance effect 5. Do not insert the heating rod into the sand to avoid affecting the temperature control. matters needing attention: 1. When cleaning the heating rod, please turn off the power for cooling 15-20 minutes in advance to avoid burns. 2. Do not use detergent, solvent, acid liquid cleaning. 3. Do not let children touch and play. 4. This stainless steel heating rod is only suitable for fresh water 5. The heating rod must be completely submerged Temperature indicating scale can be adjusted between 20~34℃(68~93°F). It can ensure the output of heat and keep the water temperature inside the tank steady. Totally submersible, waterproof double insulation, durable and safe design. Power indicator, ensures safe operation. Can automatically adjust the temperature, good for fish in the aquarium.