Hengjiaan 37 in 1 Arduino Sensor Module Kit Pack Learning Package Kit for Arduino UNO This is the new 37 sensor modules Starter Kit, developed specially for those beginners who are interested in Arduino. A complete set of Arduino's most common and useful electronic components. This kit has the free PDF tutorial. After purchasing, just send an email to us with title "Require pdf for sensor kit". Will provide you the PDF documents t. You can enjoy you projects. Standard interface can be controlled directly by microcontroller, for Arduino , Raspberry Pi, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic, etc. Temperature sensor module, 5V relay module,Small passive buzzer module, Detect the heartbeat module, Infrared emission sensor module, Laser sensor module, etc. Come with a big plastic box which have a small separate compartment for each module.