1. using the NTC thermistor sensor , good sensitivity 2. the comparator output signal clean waveform is good , driving ability, than 15mA. 3. adjust the temperature distribution bit detection threshold 4. Working voltage 3.3V-5V 5. the output format : Digital switching output (0 and 1) 6. with bolt holes for easy installation 7. a small board PCB size : 3.2cm x 1.4cm 8. using a wide voltage LM393 comparator