2 working modes available for choice: only LED Light flashing or both sound and LED flashing. 3 levels of volume adjustment: High or Medium or Low. 38 ringtones for choose. Receiver working effective range is up to 70 meters. The 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 work in the back or out of sight when customers come in store. It can also be used as a signal when animal is ready to enter or leave. Applications: entry alert, intruder alarm, passageway alarm, bug detector, car alarm (indoor), security monitor warehouse, power supply closet alarm, garage and tool shed monitor, mailbox sensor, front door or walkway detection. Package includes: one plug-in electronic receiver, two motion detectors PIR (power by 3 AAA batteries, NOT INCLUDED) and English instructions.