The receiver will have a plug-in 12 volt power supply . It may be placed on a tabletop or attached to a wall using the mounting holes on the rear of the DWA-9 receiver. There are also four volume controlled tones to identify each zone on the and DWA-9-4000 at this time. The customer may use additional transmitters and receivers ( APPLICABLE TO THE DWA-9 -4000) AT THIS TIME ) ,if they wish. Each receiver comes with choice of 12 volume controlled tones. The wireless motion drive alert will work with all our optional driveway alarm accessories. Each receiver will have an On/Off Switch , 2 form "C" relays and a timed output of 1 seconds 5 seconds,10 seconds or 10 minutes for use with accessories.