PiSector Inc. has no dealership and sells directly to you Genuine PiSector products. If you buy a PiSector product from other sellers, then you and the seller are infringing our copyrights [http://www.uspto.gov/web/trademarks/tmog/20121023_OG.pdf#page=00000571]. Power Supply: AC 220V DC 9V Internal Power: Ni-Mh battery, DC=7.2V Static Current： less than 50mA Alarm Current： less than 300mA Wireless Frequency: 433±0.5MHz Wireless Receiving Sensitivity：5mV/ m Outer Alarm Siren Volume：110dB Working Condition：Temperature-10～40degree Humidity： less than 90% Capacity for Wireless Device：99pcs Wire Device：7pcs Weight: 1.2Kg/set Size : 160*110*35 mm Requires a land phone connectionPackage include 1 x console 2 x remote controllers 5 x Door sensors 1 x mini siren 1 x adapter