【Motion Sensor Alarm & Welcome Chime for Business Entrances】This indoor motion sensor alarm instantly alerts you the moment a customer or visitor walks in — working as a reliable motion sensor door chime for retail stores, shops, offices, and warehouses. Perfect as a store walk-in motion sensor bell that greets every guest without you lifting a finger.

【3 Modes, 11-Language Chime & Loud Alarm Siren】Switch instantly between a friendly welcome chime, a loud anti-theft alarm siren, or a smart no-repeat mode. Acting as both a motion detector alarm and a security alarm, the M120 doubles as a dependable home alarm and business alert system in one device.

【PIR Infrared Motion Sensor with Human Detection, 20–26ft Range】Built with a precise PIR infrared sensor, this motion sensor alarm indoor detects real human movement up to 26ft while filtering out pets and airflow — a true infrared motion sensor alarm delivering fewer false alerts and reliable indoor motion sensor coverage for doors, counters, and stairways.

【4-Level Volume & Dual Power — USB or Battery】Adjust volume across 4 levels, from a quiet office chime to a clear storefront alert. Runs on batteries or USB 5V DC. Low-battery voice alert ensures your security is never interrupted.

【Tool-Free Install with Remote Control — Ready for Any Business】No wiring, no drilling — mount this motion sensor alarm with remote in under 2 minutes. As a wireless motion detector alarm indoor solution, staff can adjust volume, switch modes, or arm/disarm from anywhere, making it ideal motion sensor security for any home or retail space.