Check the listing for details. 120db Super Door Stop Alarm. Condition: New. Listed at 12.95 USD. Use the Super Door Stop Alarm as an entry alarm and to help block a door from being opened. If anyone tries to open the door when the unit is set in place and turned on, this portable unit will sound a 120dB alarm. The alarm stops when pressure is released from door stop plate. There is also a movement sensor with adjustable sensitivity that will activate the alarm if its tampered with. Great for hotel stays, your apartment, or home! The on/off switch is on the back of the alarm, and the unit also features a low battery indicator light. Uses one 9-volt battery (not included). Measurements: 6 3/8" x 1 3/4" RETURN POLICY: There are no returns accepted for this item. QUESTIONS? For any product related questions, please send us a message on eBay. We will be happy to assist you.