Portable,adopts ABS material, lightweight, antirust and durable.Whether you travel or go on business, you can take it with you everywhere and anytime.free of a burden.Is your home travel necessary.120 dB ultra loud alarm ringing. turn it on and the loud alarm will frighten away unwelcome invaders, thus protecting you and your families.It can be cycle use .To stay at the hotel, you can install this door alarm on the door and window, it will protect you, upon checking out, take the alarm with you for next-time use.Easy to use,just turn it on and hang it on the inside door handle in no need of special wires,safe and secure, intelligent efficient, convenient operation.When don't need to use the alarm, only put the switch to "ON" position, and the alarm devices in stand-by.Door alarm can be widely used in your house, office or factory, hotel and so on .When you install the touch sensor in your house, office or factory, it will ring to alarm once children open the doors and windows or a theft breaks in.