GREAT SELF-DEFENSE ITEM FOR ANY AGE. THE KEY CHAIN EASILY ATTACHES TO BACKPACKS, PURSE OR CAR KEYS. IT HAS A BUILT-IN LED LIGHT TO HELP IN DARK/LOW LIGHT AREAS. IN CASE OF EMERGENCY SIMPLY PULL THE PIN TO SOUND THE SAFETY ALARM. THE ALARM IS 100 - 110 DECIBELS AND CAN BE HEARD UP TO 175-225 FEET, DEPENDING ON SURROUNDING CONDITIONS. THE ALARM WILL QUIT ONCE THE PIN IS REPLACED OR UNTIL THE BATTERY DIES. THREE LR44 REPLACEABLE BATTERIES AND INSTRUCTIONS ARE INCLUDED. COMPLIES WITH PROP 65. 1.5" W X 2.375" L X 1" H