Keychain design is perfect for use with house keys or car keys.
Pull the keychain to activate, push the keychain back to stop the alarm.You can put the pin back in and continue to have it for use!
You can use it anywhere. It is not just for a child's women's safety. The sound it makes is extremely piercing and continuous that it would give you that few crucial moments of startling or stunning a potential attacker to escape from them.