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Heart Rate Pulse Sensor Module ( Pack of 25)
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Pulse Sensor is a low-cost, very small-size plug-and-play heart rate sensor for Arduino and Arduino compatible boards. It can be used by students, artists, athletes, makers, and game & mobile developers who want to incorporate live heart-rate data into their projects easily. Pulse Sensor Amped adds amplification and noise cancellation circuitry to the hardware. It's noticeably faster and easier to get reliable pulse readings. Pulse Sensor works with either a 3V or 5V Arduino.
Video Tutorial on Heart Rate Monitoring with Arduino

Pinout of Heart Rate Pulse Sensor Module
| Power supply voltage | 3.3V ~ 5V |
| PCB Diameter (mm) | 15 |
| Package Dimensions | 8 × 6 × 2 cm |
| Weight | 50 grams |