Pulse Sensor is a well-designed plug-and-play heart-rate sensor compatible with Arduino. It can be used by students, artists, athletes, makers, and developers who want to easily incorporate live heart rate data into their projects. The sensor clips onto a fingertip or earlobe and connects directly to Arduino using jumper cables. It also includes an open-source monitoring application that graphs your pulse in real time. Color: Black Material: ABS Plastic Power Supply: 3-5V Compatible With: Arduino, Raspberry Pi Diameter: 16mm Magnification: 330 LED Wavelength: 609nm Dimensions: 220mm (L) x 16mm (Diameter) Package Included: 1 x Pulse Heart Rate Sensor Module Note: Lighting and display settings may cause slight color variations between the image and the actual product. Measurement error tolerance is +/- 1-3cm.