Bewegungsmelder-Türklingel für Geschäftseingangsalarm, Begrüßungssummer-Überwachungs-Türklingelalarm für Senioren zu Hause (1 Sensor und 2 Empfänger)

[Welcome Doorbell Monitor] Users can receive alerts when someone enters or exits using the doorbell. It can detect visitors through the front or back door. Portable design, easy to install in homes, offices, and shops, and can also be used in mailboxes, garages, driveways, etc. [17 Ringtones and 5 Welcome Doorbell Tones] Welcome/Doorbell/Alarm/Colored Light/Lighting Modes. The doorbell receiver has 17 built-in ringtones, from melodies to simple buzzers, to meet your personalized needs; in addition, there are 5 shop welcome tones. [Long-Range Sensing] The sensor has a transmission range of up to 280 meters (918 feet), and the infrared sensor has a sensing range of approximately 2~8 meters/6.6~26 feet, effectively alerting you. When the doorbell sensor detects movement, the receiver will sound an alarm and the LED indicator will flash. You can place the motion sensor detector on the porch, hallway, or mailbox, and place the receiver indoors. [Easy Installation] The doorbell receiver requires no wiring and is easy to install with a self-adhesive design. The detector is wall-mounted. It can be powered by batteries or micro-USB. Please read the instruction manual carefully and install the batteries (not included) before use. Adjust the sensor angle to prevent false alarms. [Wide Applications] Suitable for mailboxes, driveways, corridors, gates, doorways, walkways, entrances, apartments, offices, hotels, shops, and many other patios. Not suitable for outdoor use; motion sensor doorbells are not waterproof. Can also be used for child safety and to alert caregivers of the elderly.