The Viper D9957V is a premium long-range 2-way remote start and security transmitter kit designed for Viper DS3 and DS4 systems. The biggest buying considerations are range, 2-way confirmation, LCD functionality, and whether you want a full security system or just remote-start capability. The D9957V is one of Viper’s higher-end remote kits and is popular because it gives users: Long-range vehicle control Visual confirmation back from the vehicle LCD status updates Remote start functionality Security monitoring capability The system is designed for compatibility with: Viper DS3/P systems Viper DS4/P systems SmartStart smartphone integration modules Key Features 2-way remote start & security transmitter kit Up to 1-mile range Color LCD command-confirming remote 1-way backup transmitter included 5-button control layout Vehicle status confirmation Rechargeable LCD transmitter Bluetooth smartphone compatibility Remote start support Security system support Lock/unlock control Trunk release support Auxiliary channel control What Comes in the Kit (1) 2-way color LCD transmitter (1) 1-way backup remote Antenna/control center Valet switch LED status indicator Associated harnessing depending on package purchased Security FeaturesDepending on the connected Viper system, it may support: Shock sensor monitoring Starter kill Tilt sensing Door trigger monitoring Panic mode Horn honk confirmation Parking light flash Smartphone control integration