Using TCRT5000 Reflective Infrared Sensor Detection of reflected distance: 1mm~25mm applicable Working voltage of 3.3V-5V Using wide voltage LM393 comparator Output format: digital switching output (0 and 1) Color: blue Material: ABS Package Contents: 20 x TCRT5000 Sensor Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.