This is a sound and impact sensor chime set made by REVEX. Transmitter: XP60 Receiver Chime: XP700 Used approximately 5 times in half a year. Operation has been confirmed. There are some minor, inconspicuous scratches on the surface. The included base was attached to the wall with the also-included double-sided tape, which has been removed, leaving adhesive residue on the back of the base. Double-sided tape and instruction manual are not included. - Brand: REVEX - Model: Security Alarm - Settings: Low, Medium, High - Color: White - Included items: Wall-mounting base Thank you for viewing.