LUYS PTC Aquarium Heater (50W / 100W / 200W / 300W / 500W), with External Temperature Controller and LED Temperature Display for Fish Tank

How to use the temp setting?
Press the button on the controller over and over, the set temp digits will go circularly from 68℉ to 93℉, when you set it to the digit you want, stop and wait the led flashing for 4 times, then the setting is done and the led will go on displaying the water temp.

Heating indicator light
There are 2 indicator lights below the display screen, the left light will on red when the heater is heating, the right light will on green when it stops heating.

Electronic temperature control heater
Specifications:
Voltage:110 V-120V Frequency: 50HZ
Led Indicator Light:When it working, the indicator light is red.
Temperature Range: 68℉ to 93℉ Temp exactness:±1℉

Aquarium Heater Submersible:
Double-loop circuit design, the water temperature sensor is installed in the IC circuit to prevent air burning and heating over temperature.
Temperature control is accurate adjustable.