About parameters: the model is DS18B20, number of pins is 3; Voltage supply is 3V-5.5V, temperature resolution is 9 to 12 bits, and the sensing temperature is -55 Celsius +125 Celsius, accuracy is +/- 0.5 Celsius. DS18B20 one-wire digital temperature sensor: the singe 1-wire interface requires only one port pin for communication, it just requires one data line and GND to communicate with your microcontrollers. 3 Pins: the DS18B20 sensor has 3 separate pins for GND, DATA, and ; DATA is the digital signal input or output terminal; GND is the power ground; is the external power supply input terminal. 2 Modes: the temperature sensor can operate in normal or parasite mode, in normal mode, each sensor is connected between a power line () and ground (GND), and the data output (DATA) connects to a third data line; In parasite mode, both GND and need to be connected to ground. Wide application: the DS18B20 temperature sensor can be applied for thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system. Colour: black Material: plastic Package Contents: 20 * DS18B20 Temperature Sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.