Dual Protection 1:This portable door lock provides you with extra security and privacy, greatly improving your security and preventing unauthorized entry, so the door can't be opened from the outside, not even with a key; which is a great helper when you are on business and trips, or live alone. Dual Protection 2: the door stopper alarm with 120DB siren, Once someone opens the door, the door stopper alarm go off in the first place, they scaring away bad guys and helps wake you and give you time to find help. EASY TO USE: Easy to install or remove, Our Security Door lock Kit can be installed in seconds without any tools, Perfect for hotels, dormitories, apartments, short-term rentals, Airbnbs, bathrooms, bedrooms, or private rooms. It may also be applied to avoid pets going out, and also to prevent children from opening their doors to strangers. Battery: 1 * 9V battery (not included) Colour: black+silver+red Material: plastic Package Contents: 1 * Alarm door plug 1 * Door lock Only the