The Rosewill RSHS-11002 travel alarm is a great method to protect you and your property from theft when you are away from home or in sleep. It can be easily setup - just hang it on the door knob and insert the door clip sensor into the door gap. If any vibration is detected, it would sound 100 dB alarm to scare away the intruder. LED flash light with up to 30 Lux is built right in for emergency use.