Doorbell design with 36 ringtones and 5 welcome chimes for personal preferences. 4-level volume adjustment (Loud, High, Middle, Low) ranging from 113 to 25 dB. Features welcome, alarm, doorbell, and night light modes—5 in 1 automatic door chime. Includes 4 LED light colors: Colorful, Red, Blue, Green, allowing differentiation of multiple entrances by light color. Transmission range up to 280 meters (918 feet), detection range approximately 2 to 8 meters (6.6 to 26 feet) for reliable alerts. (Note: This device is not waterproof. Keep it away from rain or cover adequately. Place the sensor at the entrance of your driveway and the receiver indoors.) Install the receiver inside your home and position the sensor at locations such as door entrances, home mailboxes, driveways, walkways, apartments, offices, hotels, stores, and other indoor areas. Receiver features self-adhesive installation; detector is wall-mounted. Powered by batteries or micro USB. Before use, carefully read the manual, insert batteries (not included), and adjust the sensor angle to prevent false alarms.