Pulse Sensor is a well-designed plug-and-play heart-rate sensor. It can be used by students, artists, athletes, makers, and game and mobile developers who want to easily incorporate live heart rate data into their projects. The sensor clips onto a fingertip or earlobe and connects using standard jumper cables. It includes an open-source monitoring application that displays real-time pulse data. Color: Black and red Material: ABS plastic Power: 3-5V Compatible with: Raspberry Pi Diameter: 16mm Magnification: 330 LED Wavelength: 609nm Dimensions: 220mm x 16mm Package Contents: 1 x Pulse Heart Rate Sensor Module Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.