1. Features: - Uses NTC thermal sensor high sensitivity. - Comparator output good signal good waveform strong driving ability more than 15mA. - With a potentiometer adjust temperature detection threshold. - Working voltage: 3.3~5V. - Output: digital switch output(0 and 1). - With fixed bolt hole convenient to install. - PCB dimension: 3.2cm x 1.4cm. - Uses the LM393 wide voltage comparator. 2. Specifications: - Working voltage: DC 3~5V. - Working voltage: <20mA. - Sensor type: analog. - Width of detection: 40mm x 16mm. - Workmanship: FR4 two-sided tin coated. - Working temperature: 10'C~30'C. - Working humidity: 10%~90%(No condensation).