Dear buyer, Welcome to my shop, if you have any question please let me know, I will do my best to help you when received your mail(will reply within 48hours), thanks for your understand,if want many quantity or many items total please contact me,maybe will have a good price,Have a nice day! Applications: 1. Security Products 2. the human body sensors toys 3. the human body sensor lighting 4. industrial automation and control, etc. It can automatically and quickly open various types of incandescent, fluorescent lamps, buzzer, automatic doors, electric fans, automatic washing machine and dryer Machines and other devices, is a high-tech products. Especially suitable for enterprises, hotels, shopping malls, warehouses and family aisles, corridors and other sensitive Sense of region, or for the security zone automatic lighting, lighting and alarm systems. The HC-SR501 is a Passive Infrared motion detector which detects changes in infrared in front of it, triggering a high signal on the output pin. There are 3 pins, VCC, Output and GND. Supply between 5V and 20V. There are two adjustable potentiomiters, The one in the bottom right of our picture adjusts how long the output stays high for and the one bottom left adjusts sensitivity. The output is either 0V or 3.3V so it's safe to use with either 5V or 3.3V Arduinos and Raspberry Pis without level shifters. Working voltage 5V to 20V. Current drain: 50uA Detection distance: 3--7M (Adjustable, bottom left pot) Detection angle: 120 Approx Size: 32 x 24mm Shipping: We Ship to Worldwide. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to bidding/buying. The item will be shipped out within 48 hours on the weekdays ( Monday to Friday ) or the next business days on the weekend after full payment must be received. Only ship to the Address. Please make sure your address in is Correct before you pay. we are not responsible for any wrong or undeliverable addresses. We will ship out the item by AirMail from China or Hong Kong Post Office. If want send by DHL UPS EMS or other Express shipping please contact me to change the shipping cost. We will send the item as " GIFT " It takes about 15-40 working days to arrive. Sometimes take a little longer , Due to Local dispatch or other reasons, It might goes more than 20 days . Payment We accept PayPal only. All major credit cards are accepted through our secure payment processor PayPal. Payment must be received within 10 days of auction closing. Refunds Returns If you do not satisfied with your purchase, or if it is damaged when receive, please let us know, we will do our best to help. If the problem cannot be solved, please return it to me in the condition it was received within 7 days. we will send you replacement or give you a refund. All returns should include all original items undamaged, in re-saleable condition, all original packaging including manuals, warranty forms. Buyers is responsible for the returning shipping cost. We care about our valued customers, and will always try to help you. So if you have any problems, please message us immediately. Please give us the opportunity to resolve any problem. We understand the concerns and frustrations you might have, and will try our best to resolve the issues.Please contact us BEFORE leaving any negative or neutral feedback or open any dispute on paypal.