Features of hygger submersible heater
1. Fast heating and reliable, fully automatic control.
2. ABS black plastic heater guard with 2 strong suction cups.
3. Suitable for freshwater and saltwater aquarium use.
4. The controller with memory function in case of power-down.
5. Durable and explosion-proof quartz glass heater tube.
6. Very easy to install and use.

Automatically stop and restart heating
It will stop heating when the water temp reaches to the set temp. Please note that the water temp may go up 1℉ more because of the waste heat.
When the water temp is cool down to 1℉ less than the set temp, the fish tank heater will restart heating.