Descriptions:1.Glass tube with great high temperature resistant and explosion-proof.2.Easy to attach on aquarium tank wall with suction cups.Specifications:Product Name: Constant Temperature Heating RodType (Optional): EU 25W(220V)/EU 50W(220V)/EU 100W(220V)/EU 200W(220V)/EU 300W(220V)/US 25W(110V)/US 50W(110V)/US 100W(110V)/US 200W(110V)/US 300W(110V)/UK 25W(220V-240V)/UK 50W(220V-240V)/UK 100W(220V-240V)/UK 200W(220V-240V)/UK 300W(220V-240V)Material: Quartz Glass&MetalColor: BlackSize: 25W/50W Length: 205mm/8.07in, 100W Length: 265mm/10.43in, 200W/300W Length: 305mm/12.01inCable Length: 800mm/31.50inWeight: 25W/50W Weight: 168g/5.93oz, 100W Weight: 211g/7.44oz, 200W/300W Weight: 235g/8.29ozVoltage: 110V-240VFrequency: 50Hz-60HzPower: 25W/50W/100W/200W/300W/500WTemperature Control Range: 20 ℃ -34 ℃Package Informations:Package Size:320x70x50mm/12.60x2.76x1.97inPackage Weight: 260g/9.17ozGeneral PackagePackage Included:1 x Constant Temperature Heating Rod1 x ManualNotes:1.Please allow 0-3cm difference due to manual measurement.2.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.