2 working modes available for choice: single LED light flashing or both sound and LED flashing. 3 levels of volume adjustment: High or Medium or low. Receiver effective working range goes up to 70 meters. PIR motion detection distance is 3-7 meters. It can be successfully used for your home, office, store, hotel or other buildings. Ideal for alerting business owners who are working behind the back or out of sight when customers enter store. It can also be used as a signal when animal is ready to enter or exit. Applications: entry alert, anti-intrusion alarm, corridor alarm, critter detector, car alarm (interior), home monitor warehouse, power closet alarm, garage and tool shed monitor, mailbox sensor, front door or gateway detection. Package includes: one plug-in electronic receiver, two motion detector PIR.