[PREMIUM SHATTERPROOF GLASS]Made of shatterproof glass and BPA-free plastic. aquarium heaters are fully submersible and safe for fish without any toxic substance producing.3 FREE artificial aquarium plants as ornament in your tank. [NO LONGER CHILL YOUR FISH]Automatically regulate and maintain water temperatureimitate the original ecological environment for your tropical fish.Provided fish with warm water environment.Perfect to apply to fresh and salt water. [ADJUSTABLE TEMPERATURE]Temperature range: 68F~93F.25W heater:suitable for fish tank within 7 gallons,Length:7.8.Easy to adjust temperature by the aquarium heater that suit more species of fish. [AUTOMATIC CONSTANT TEMPERATURE]When water temperature reaches set value,the indicator light will be OFF and the heater will automatically stop heating.The heater will automatically start heating and indicator light will be ON if water temperature is low.You could place heater horizontally or vertically. [ATTENTION]Please place the heater near place (filter or pump) of water flowing to keep more even water temperature.Unplug the heater 30 minutes early when changing the water for the fish tank.