Cheap And Discounts 100% New HC-SR501 Adjust IR Pyroelectric Infrared PIR Motion Sensor Detector Module for arduino for raspberry pi kits + Case Wholesale. Buy Directly From Merchant Shenzhen Yonglina electronics store Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.