Directed Electronics 479P 2-way LCD Replacement Remote Transmitter 4-Button, 2-way Responder Remote Control Direct replacement for the Viper 561XV, 790XV, 791XV, 690XV, 691XV Python 880XP, 881XP, 680XP and 581XP Clifford Matrix RS III, RSX 3.5, 2.5X and RSX 1.5 Remote Features:LOCK, UNLOCK, AUX, PANIC Light:LCD Board:Two Way 433Mhz