Features: 37 in 1 / 45 in 1 Sensors Assortment Kit Sensor starter Kit Fit for Arduino MCU Education Infrared sensor receiver module Outlets and voltage differ internationally.Please check compatibility Specifications: 37 PCS Kit Includes:Joystick sensor/Relay module/Microphone/Small microphone sensor/Tracking sensor/Obstacle avoidance /3 color LED sensor/ Two-color LED/ Small two-color LED/3 color RGB/Colorful flashing LED/ Infrared emission /Infrared receiving /Linear Hall sensor /Flame- Sensor / for touch sensor/ temperature sensor/Active buzzer/Passive buzzer/ reed switch module/ Mini reed /Finger test heartbeat/Laser- for head sensor /for Key switch module/Vibration switch sensor/Rotary encoder sensor /Magic light cup sensor/Tilt- switch module/Photoresistor sensor /Temperature humidity sensor/Analog Hall sensor /Hall magnetic sensor/Analog temperature sensor/18B20 sensor/Knock sensor /Light Interruption Sensor /Mercury-switch module 45PCS Kit Includes: for joystick joystick module/Infrared sensor receiving /Laser- for head sensor/Temperature and humidity sensor /Infrared emission sensor /5V Relay /Obstacle avoidance sensor / Finger detection heartbeat module/microphone sensor/Metal for Touch Sensor /Flame- sensor /3-color LED module/Hunting sensor /Linear Magnetic Hall Sensor/Rotary encoder module/Active buzzer module/Magic Light Cup Module/Small passive buzzer module/Digital temperature sensor /Photo breaker module/Temperature sensor/ Two-color LED common cathode module 3MM/Mercury- Module/Hall Magnetic Sensor/3 color full color LED smd module/Mini reed /Tilt- switch module/Colorful automatic flashing LED module/for Key switch module/Photoresistor Module/Vibration switch module/Knock Sensor /Temperature sensor/Analog Hall Magnetic Sensor/Microphone Sound Sensor/Large reed Module/Two-color LED module/breadboard power module/Ultrasonic module/MP1584EN step-down module/SD card read write module/Gyroscope module/Soil module/DS1302 Clock/Water level Package Includes: 1 Set x Sensor Modules note: The measurement allowed error is1-3cm.