Super Shatterproof 1.5 mm Thickness Quartz Glass
Maximum strength Quartz Silica Tube is shatter resistant & more durable than conventional glass heaters.

Durable Plastic Outer Sleeve
There is a durable thick plastic outer housing wrapping up the glass tube.
Acting as a buffer between your fish and the hot heater with Non-conductive plastic outer sleeve so fish/turtle/plants can't be burnt.

Suction Cups
The 3 suction cups provided fit into the protective outer sleeve in a very unique way. They can hold heater vertical or horizontal under the water.

Thermostatic Control
This fish tank heater can automatically control the temperature. It will automatically turn off as the temperature rises above the internal setting you choose, and turns back on like clockwork once it sufficiently cools down.

Specification:
Diameter: Glass tube 1.02inch (2.6cm). Plastic housing 1.3inch (3.3cm).
Cable length: 5-6.5 feet (150-200cm)
Water Volume: 10-30 gallons
Power: 500W
Voltage: 110V
60HZ
Adjustable temperature: 68°F~94°F (20°C~34.5°C).
Outer Dimension: 11inch x 1.4inch x 1.4inch

Operation instruction:
1, The 100 watt aquarium heater could be installed horizontally and vertically, and it should be immersed into water completely.
2, When the water is not enough, the heater reads E1, and need to add more water.
3, It takes about 10~15 minutes to get used to the water temperature. Then adjust and set the desired temperature value.
4, It starts to work if the actual temperature value is lower than the settled value, unless it doesn't work.
5, We suggest the horizontal installment.

Note: Due to some unpredictable external factors, it's normal that the temperature difference is ±5°F.
The temperature zone is 2 degrees each click.The small dot between each 2 numbers means 2 degrees difference.