GMpreheat allow user to start engine by scheduler from android based phones via OBD II device : Scantools.net - Obdlink Mx (bluetooth, wifi) GMpreheat will be compatible with vehicles that supports sw gmlan,can bus communication. Supported vehicles : Full support for Impala Lt or Ltz but also supports other models. Please test functions before purchasing. Chevrolet: Impala Lt/Ltz, Avalanche, Cruze, Equinox, Corvette, Camaro, Cobalt, Malibu, Silverado, Sonic, Suburban, Tahoe, Volt. Cadillac:D