We've included in the 24-SSOP (0.154, 3.90mm Width) package so that RF Receiver's easier to use.Tray is the packaging method.There is 2V~5.5V supply voltage for this RF Receiver.Most of its uses are found in General Purpose.DUAL is the position of RF transmitter and receiver's terminals on the board.It performs extremely well at a frequency of 153kHz~279kHz 520kHz~1.71MHz 2.3MHz~26.1MHz 64MHz~108MHz.The terminations of RF Receiver total 24.