With 5V DC working voltage, the output port of the infrared tracking sensor module can be directly connected to the SCM IO port, also can drive a 5V relay module or buzzer module directly. Please note that target reflectivity and shape is the key point of detection distance. Small and black objects have minimum detection distance, while and white ones have maximum distance. When the infrared tracking sensor module detects obstacles signal, red indicator lights will turn on and OUT port outputs low voltage level signals continuously at the same time. The infrared tracking sensor module is widely used in robot obstacle avoidance, car obstacle avoidance, assembly line counting and black white line tracking. colour: red Material: PCB Size: 66.9x16.9mm Package Contents: 1 x Tracking 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 the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.