Package Content: 2Sets x RC-31 Magnetic Door Switch, a package of screws for mounting on wood only. Switch Size(Approx): 55*12.5*11.5mm / 2.17" x 0.49" x 0.45"(L*W*H), Mounting Hole Size: 7 x 2.5mm/ 0.28" x 0.1"(L*W), Contact Type: NC/NO/COM Transmitting Distance: 15-25mm, Rated Power: 10W, Max Voltage: 100V, Max Current:0.5A. This switch contains normally closed and normally open contacts, great for alarm,LED,Relay,GPS low voltage devices...etc, ideal wooden door or window use. Help deter theft with this magnetic switch that is compatible with most vehicles with a sliding window., Weight: 0.0881849048 pounds, Manufacturer: Aoje Link-Electric