Product Name: Wedge Shape Door Stop Alarm Traveling Portable Alarm Model NO.: DA201 Receive Frequency: No Alarm Volume (within 1m): ?110dB Transmission Mode: Wireless Working Principle: Electromechanical Application: Indoor Certification: RoHS Working Mode: Active Signal Transmission: Wireless Alarm Type: Home Alarm Product Name: Door Stop Alarm Color: Random Trademark: OEM Transport Package: One Piece in a White Box Specification: 5*28*138mm Origin: Shenzhen, China HS Code: 8531100000 Product Description Wedge Shape Door Stop Alarms Traveling Portable AlarmsSpecifications:Powered by: 4*AG10(it is included)Dimensions: 5*28*138mm (Approx)100% brand new and high qualityDual Function Alarm & Door StopKeeps intruders outPrevent the doorknob from hitting the wall if the door is opened too roughly120dB super loud alarm when activatedSensitivity adjustableUsage: Home, Dorm, Office Hotel & moreNo installation required, just place it behind the doorPhotos: