Compact Design: This motion sensor alarm is portable and can be fixated on the wall, placed on a desk, or carried by hand. Loud Siren: Features a 90 dB alarm siren that sounds off for 15 seconds with flashing red light when motion is detected. Multiple Modes: Offers three operation modes: Alarm Mode, Voice Mode with adjustable volume, and Music Mode with 32 programmed songs. Dual Power Options: Can be powered by 3 AAA batteries or an AC power adapter with DC output 4.5V. Wide Detection Range: Infrared detection range covers a 110-degree horizontal angle and up to 20 feet in vertical range. Versatile Use: Suitable for home security, retail stores, offices, warehouses, and even as a campsite watchdog. Low Power Consumption: Designed for long-lasting operation with minimal power usage. Adjustable Detection: Comes with a swivel bracket for easy adjustment of the detection angle. Item Name: Doorbell Material: Plastic Operation Mode: Alarm Mode, Voice Mode, Music Mode Voltage: 4.5V Power Supply: 3 AAA Batteries (Not Included) /AC Power Adapter/D.C Output Between (9-15V.) Horizontal Angle, Infrared Detection Range: 110 Degrees Vertical Angle, Detection Distance: 20 Feet Features: Portable, Versatile, Dual Power Size Details: Length: 8cm/3.15" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Doorbell