W1209 Digital Temperature Control Switch is a programmable themrostat. The same module can be used in both controlling / maintaining Cold and Hot temperatures. Parameter 0 can be set to either Hot or Cold Control setting. The relay module is based on a microcontroller (MCU) and has 7 user configurable parameters accessible using 3 push button
4.1V~5V (not more than 5.1V, when using charger power supply, car charging power supply or DC-DC power supply, pay attention to the power supply voltage and ripple voltage, can string a diode)
Serial port bluetooth, Drop-in replacement for wired serial connections, transparent usage. You can use it simply for a serial port replacement to establish connection between MCU and GPS, PC to your embedded project and etc.
This module is sensitive to the flame and radiation. It also can detect ordinary light source in the range of of a wavelength 760nm-1100 nm. It can be used as a flame alarm or in fire fighting robots.