Specification Brand : ElectronicNova BulletPoint : 10pcs Temperature Switch Thermistor Thermal Sensor Module Sensitivity Adjustable DC 3.3V - 5V ExternallyAssignedProductIdentifier : 5202036913490 ItemName : 10pcs Temperature Switch Thermistor Thermal Sensor Module Sensitivity Adjustable DC 3.3V - 5V ItemTypeKeyword : sensor-blocks Manufacturer : ElectronicNova Material : iron PartNumber : TFDZLMMic-18205 ProductDescription : Description 1. can detect temperature of the surrounding environment 2. sensitivity adjustable (shown in blue digital potentiometer control) 3. working voltage of 3.3 V - 5 V 4. output form: (a) analog voltage output (b)digital switch output (0 and 1) 5. has fixed bolt hole, convenient installation 6. PCB size: 3 cm * 1.6 cm 7. power light (red) and digital switch output light (green) 8. comparator using LM393 chip, work stable Module Interface Specifications (4 wire) 1. VCC external 3.3 V - 5 V 2. GND external GND 3. DO small plate switch digital output interface (0 and 1) 4. AO small plate analog output interface