ACTIVE SHOOTER? Emergency Lockdown? Locks Me In is a portable, keyless door lock. Installed without any tools. It is used on in-swinging doors. Stop Intruders. Need a lock for an Emergency Lockdown. Can be used on doors in public places, classrooms, and offices doors. This lock will stop an intruder from entering an area. It will not allow someone with a Master key from entering your room. It can be used in case of an "active shooter" to secure your hiding place until the police arrive. It is lightweight and totally made of steel. It can be installed in seconds without even leaving the room. Locks Me In might just save your life. Made in the USA.