Product Content: 2 x RC-39 Recessed Magnetic Door Switch; Color: Black, Material: ABS. Size: 23mm x 16mm x 6mm/0.91" x 0.63 x 0.24" (L*W*H). Contact Type: NC (Normally Closed), Actuation Distance: 15-25mm, Max Voltage: 100V, Max Current:0.5A. Door contact sensors used with commercial or residential access systems and all security access and burglar alarm system. Adopt double-sided tape design, with mounting screws, two kinds of installation options for easy installation., Weight: 0.0440924524 pounds, Manufacturer: Aoje Link-Electric