NineLeaf Motion Sensor Alarm Door Buzzer for Business Entry — Motion Sensor Ring, 918ft Long Range, Anti-theft, 4-color LED, 17 Music, 5 Volume Levels, Easy Installation — 4PK (for Shops, Offices, Hotel)

Pack of 4 wireless motion sensor doorbells designed for retail and business entrances. The receiver requires no wiring—just plug it into an outlet and secure it with the included self-adhesive tape. Mount each detector on the wall, insert batteries, and set the sensor angle to minimize false triggers before first use. Note: for indoor use only; avoid direct sunlight and damp environments such as rainforests. Customizable alerts: choose from 17 ringtones, including 4 retail store welcome tones, and set one of 5 volume levels. Bright 4-color LED lights add a visual cue to each alert. For quiet settings, switch to Silent Mode where a strong vibration alert provides discreet notifications without disturbing others. Power and efficiency: built with fourth-generation power-saving technology to reduce battery replacements. Units can run on battery power or be recharged via micro USB for flexible, eco-friendly operation. Range and applications: transmitter-to-receiver range reaches up to 918 feet (280 meters), making this set suitable for shops, shopping malls, offices, factories, hotels, upscale clubs, homes, villas, and more. Installation is straightforward with the self-adhesive tape, and the product includes a one-year warranty for added peace of mind.