Streetwise PRO-TEC-DOOR Alarm

this is the doorknob alarm it's a really unique alarm system and it works using dual sensing technology it works on whether or not someone touches the doorknob or whether out the door actually moves you can set the sensitivity of the movement on the back this works off of three Triple A batteries which are sold separately and it has an alarm feature and also a chime feature so you turn the alarm on hang it on your door and just wait a little while for the door to settle down and then it's going to automatically arm itself after a certain short period of time same thing with the chime you'll arm it and it has a certain aprea time before it's ready to go and then also when he has to do is walk through the door and the chime is going to let you know that somebody has just walked in this is great if you have a business or something like that and this is a really affordable alarm and chime s