There are 2 operating modes available: single flashing LED or sound and flashing LEDs. 3 volume levels: high, medium, or low. The effective range of the receiver is up to 70 meters. The PIR motion detection distance is between 3 and 7 meters. It can be successfully used for homes, offices, shops, hotels, or other buildings. Ideal for alerting business owners who work in the back or out of sight when customers enter the store. It can also be used as a signal when a pet is ready to enter or exit. Applications: entry alert, burglar alarm, passage alarm, animal detector, car alarm (indoor), warehouse monitor, closet alarm power supply, garage and tool shed monitor, mailbox sensor, front door or entrance detection. Package includes: one plug-in electronic receiver, two PIR motion detectors.