Clifford 7153X 24 Channel 5 Button 1-Way LE Security System Remote Remote Transmitter Replacement for Clifford Matrix 3.3X, 1.3X, 320.3X, 420.4X, 520.4X Also compatible with the Python 872, 424, 524 and 580 Direct replacement for the Viper 5701, 5301, 4204, 3203 and 5204 remote start and security systems Uses the 2032 3V Round Lithium Battery!