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 is compatible with Raspberry Pi and includes an open-source monitoring application that displays real-time pulse data. Color: Black and Red Material: ABS Plastic Power Supply: 3-5V Fit for: Raspberry Pi Diameter: 16mm Magnification: 330 LED Wavelength: 609nm Dimensions: 220mm (L) x 16mm (Diameter) Package Includes: 1 x Pulse Heart Rate Sensor Module Note: Light and display settings may cause slight variations in the color shown in images. Measurement may vary by up to +/- 1-3cm.