This is a home office accessory kit designed to allow you to use your Wilson SignalBoost indoors. It includes the Wilson 859903 12V DC power supply. The converter transforms 120V AC power from a standard home outlet to 12V DC, so you can use your mobile amplifier in home. This may also be used in vehicles which have an AC power supply. Also included is the 901118 window mount. This allows you to mount the magnetic mount antenna to a window where you get good reception. The antenna attaches to the window via plastic suction cups.WSN859940. 859940. Wilson Electronics WILSON ELECTRONICS 859940 Home Office Accessory Kit for SignalBoost (TM) Amplifier.