Keep your loved ones safe with the Guard Dog Portable Entry Door Guard with Alarm! Use it at home, in shared living spaces, the bedroom, or even take this portable alarm and door lock with you on vacation - it folds down to 12" x 5" and comes with a travel bag. The folding shock-corded design self-assembles in seconds wherever you need it! Non-skid foot grips floor and steel leg prevents door from opening. In addition to blocking entry, this door stop can also be a motion-sensitive siren alarm. The on/off switch prevents accidental sounding of the 120 Decibel Siren. Alarm uses a 9 volt battery (not included). Works on most door handle styles, comes with a two length adjuster to fit commercial and foreign door handle heights. Use this door alarm for security, privacy and peace of mind! Assembly level/degree of difficulty: Easy.