Colors are as shown in main image. The 50W aquarium heater is suitable for 10-20L aquarium, length 16.5cm, voltage 220-240V, power cord is 120cm long. Please choose the aquarium heater with the right power according to our size chart. Safety first: The newly improved Sonnenn heater housing is made of strong and high temperature resistant ABS material that creates a barrier for your fish and the heater to prevent the Fish scalded. The external temperature controller makes your operation safer and more reliable. When the product runs out of water, it will automatically turn off to prevent dry burning DRY-BURNING PROTECTION: The aquarium heater has an intelligent temperature and water sensor system. When the heater is completely empty, the heater will automatically stop heating and the display will show "E1" to tell you to remind you. After you set the required temperature, the aquarium heater will turn off automatically when the temperature is reached, and turn on automatically when the temperature is lower than the set temperature. ADJUSTABLE TEMPERATURE RANGE FROM 20 - 34 C: Provide your aquatic animals with the best temperature environment. Suitable for places where aquatic life is kept, such as fish tanks, aquariums and small fish ponds. There are strong suction cups on the heater protector and thermometer, it's easy, don't install the aquarium heater on the tank walls or bottom, please keep it fully submerged. (Reminder: 1. Due to different shooting environments, there may be a slight error. Please refer to the actual item received. 2. Due to manual measurement: there may be a slight difference in size , please understand)