You're in a strange city and the cheap hotel lock isn't adding to your level of personal security. Just hang this alarm system on the doorknob and any vibration will set off a loud alarm. Its small size, and no installation required, mean this alarm is completely portable so you can take it with you anywhere. Requires three LR44
button cell batteries (included). Select a 4-digit password for use when disarming the alarm. This alarm even protects you if a thief tries to defeat it by removing the batteries, as just removing them will trigger the alarm.
The system also operates as a personal emergency alarm. Place it in your purse or pocket, or just carry it in your hand, and loop the cable around your wrist. If anyone tries to steal your purse, the chain will be pulled out and the alarm will sound. The panic button triggers the alarm instantly.