Welcome Buzzer MonitorThe owners can use the doorbell to be alerted when people enter or leave. Use it to detect visitors through the front or back door. The portable design is easy to install in homes, offices, stores, and can also be used for mailboxes,garages, driveways and more. 36 Ringtones & 5 Welcomes Doorbell RingsWelcome / Doorbell / Alarm / Color light / Lighting Model. The receiver comes with 36 different ringtones from melody sounds to simple basic buzzer for personal preferences and 5 welcome ringtones for retailstore. Widely Range The transmission range of sensor detects motion up to 918 feet (280 meters) and detection range of the infrared sensor approximately 2~8m/ 6.6~26ft to effectively keep you alerted. When the movement is detected by the sensor,the receiverwill make an audible sound and the LED light will flash. You can put the motion sensor detector at the porch, gallery, mailbox and put the receiver in your house. Easy to install As for the receiver, no wiring needed, no installation hassles, self-adhesive installation, the detector is wall mounted. Use batteries or micro USB power supply. Before using, please read the manual carefully and put in batteries (notincluded), adjust the sensor's angle to avoid false alarming. Wide ApplicationIdeal for home mailbox, driveway, gallery, gate, doorway, walking paths, door entrance, apartment, office, hotel, store and many other indoor places, not suitale for outdoor; the motion sensor door chime without waterproof function.Also for Kids safety & Caregiver Reminder for Elderly.