The Mace Brand Personal Alarm Keychain is one of our compact personal alarms. The alarm is activated by depressing the button on the front of the alarm but a different button on the back of unit is the only way to deactivate and silence the alarm. - Key Features: - The Mace Brand Personal Alarm Keychain emits a 130dB shriek that instantly brings attention to the user. - Easy to use and legal in all 50 states. - Ideal for school age children.