Hercules 3 in 1 Mini Personal Alarm with PIR Motion Sensor and LED Flashlight, 2.6 inch x 1.5 inch, Black - PS1035 Quickly activates when alarm cord is pulled Powerful 110 dB alarm sounds for 15 seconds Use as motion sensor in apartment, dorm room or hotel room. Infrared sensor detects motion up to 9 feet away Bright white LED flashlight illuminates dark areas Convenient wrist strap; batteries included Convenient small size: 2.63 x 1.49 x .94 inches