Night shift workers, elderly, disabled, joggers, and those traveling alone. Personal Alarm Mode Instruction: In case of emergency, pull out key-ring metal pin to activate siren and draw attention of police or passerby. When key-ring metal pin is inserted back into the alarm, it will stop sounding. Spotlight Mode: In the dark, press -light button for safety flashlight. Release light- button to switch off spotlight. Batteries: Use three 1.5V AG13 button batteries. When loudness of siren decreases, unscrew the battery cover on back of alarm to replace with new batteries of the same kind. Warn: Alarm can produce a very loud siren. Do not place alarm near your ear to avoid damages to hearing. Packing details: Each in blister with blister card. 200PCS/CTN. G. W.: 11kgs. N. W.: 10kgs. Carton size: 40*37.5*34 cm