This professional Temperature-Sensitive are usually used for the temperature. The module digital output DO can be connected with the microcontroller directly to detect environmental change. Using safe materials, it is safe and durable for . Features - - Material: Electronics. - Size: 3.20X1.40X1.00cm/ 1.26X0.55X0.39inch. - Working voltage 3.3V-5V. - Driving ability: more than 15mA. - This module is used to detect the temperature and trigger the microcontroller or relay module. - The module digital output DO can be connected with the microcontroller directly to detect environmental temperature change - Made of safe and reliable material, durable and professional for long time to use - The DO output terminal can directly drive the relay module and forming a temperature-controlled - The is , the waveform is good, the driving ability is strong, practical Package list: 20 x thermosensitive Relay Modules