Protect yourself when travelling and stay alert with this portable door stop alarm. The battery-operated alarm comes in a pair of two. Features a 120 Decibel loud alarm. Enough to wake you up and scare away an intruder. It requires a 9 volt battery NOT included. Perfect for both home and travel use, this doorstop model is designed to provide home defense protection and should be used indoors only. Made in China, But is shipped from west coast of the United States. This offering is for a pair of battery-operated alarms and each measures 2 inches in wide by 5 inches long and are about 1.5 inches tall. Buy now and enjoy peace of mind wherever you go. Store in your suitcases so you don't leave home without them. When Purchasing,,,purchase ONE and a set will be mailed to you. Kinda confusing!