Features: Welcome Buzzer Monitor: The 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. 17 Ringtones & 5 Welcomes Doorbell Rings: Welcome / Doorbell / Alarm / Color light / Lighting Model. The receiver comes with 17 different ringtones from melody sounds to simple basic buzzer for personal preferences and 5 welcome ringtones for retail store. 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 receiver will 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 (not included), adjust the sensor's angle to avoid false alarming. Wide Application: Ideal 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. Motion Sensor Detector Door Chime for Business Store Entry Alert, Welcome Buzzer Doorbell Alarm for Home Elderly Feature: Shop Keeper in day time, anti-thief in the night, welcome/ doorbell/ alarm/ color lights/ lighting 5 in 1 multi-function. Remote transmission range up to 280M/ 918ft in the open space. 8 channel music chip, 40mm big horn, 17 chime melodies, remember your last set melody and volume level once powerred off. Colorful LED lights, adjustable brightness, distinguish multiple entrances by different colors. 4 stages adjustable brightness, distinguish multiple entraances by different colors. Receiver can learn from up to 32 wireless sensors like PIR motion, magnetic or vibration sensor as well as up to 8 remote controllers. Application: Shops, store, commerical complex, luxury hotels, officces, factories, home, villas, driveways, walking paths, supermarket, restaurants etc.