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