2 operating modes to choose from: LED flashing only or sound and LED flashing. 3-level volume adjustment: high, medium and low. 38 ringtones to choose from. The effective operating range of the receiver is up to 70 meters. The PIR motion detection distance is 3-7 meters. It can be successfully used in your home, office, store, hotel or other building. Ideal for alerting business owners who work behind or out of sight when customers enter the store. It can also be used as a signal when the animal is ready to enter or leave. Applications: entrance alarm, intrusion alarm, passage alarm, bug detector, car alarm ( indoor), warehouse monitor, food cupboard alarm, garage and tool shed monitor, mailbox sensor, front door or walkway detection. Package includes: Receiver plug-in electronics, PIR motion sensor (3 AAA batteries not included) and English instructions. Size: receiver size: 76*80*33mm; Transmitter size: 80*59*45mm