1.Welcome BuzzerOwners can use the doorbell to sound an alarm when someone enters or leaves. Use it to detect visitors at the front or back door. The portable design is easy to install in homes, offices, stores, and can also be used in mailboxes, garages, driveways, and more.2.17 kinds of ringtones and 5 kinds of welcome doorbell ringtonesWelcome/doorbell/alarm clock/lantern/lighting model. The receiver comes with 22 different chimes, ranging from melodic sounds to simple basic beeps to suit personal preference, as well as 8 retail store welcome chimes.3.Wide RangeThe transmission range of the sensor can detect motion up to 918 feet (280 meters), and the detection range of the infrared sensor is about 2~8m/ 6.6~26 feet, which can effectively keep you alert. When the sensor detects movement, the receiver emits a sound and the LED light flashes. You can place motion sensor detectors on your porch, gallery, mailbox, and place receivers throughout your home.4.Easy to InstallAs for the receiver, no wiring required, no installation trouble, self-adhesive installation, the detector is wall-mounted. Runs on battery or micro USB power. Before use, please read the instructions carefully and install the battery (not included), and adjust the sensor angle to avoid false alarms.5.Wide ApplicationIdeal for home mailboxes, driveways, galleries, gates, doorways, sidewalks, door entrances, apartments, offices, hotels, shops and many other indoor locations, not suitable for outdoor use; the motion sensing doorbell is not waterproof. Also suitable for child safety and elderly caregiver reminders.Specification:Product Name: Motion Sensor Detector DoorbellSize: 109*64*34mmBattery life: 5-7 months (based on 30 rings per day, the package does not include batteries, you need to bring 3 AA batteries for the host and 3 AAA batteries for the remote control)Ambient temperature: -10C~+60CAmbient humidity: