Tilt sensor lets me know if the rims are taken off, back up battery is for if someone was to disconnect mine id still be able to locate it. And viper allows your car to be tracked if stolen. Also, the 2 way receiver shows me that my commands were done or not such as remote start or controlling the windows.iaum09 wrote:Is the Nissan OEM alarm system really that bad? Other than the remote start, what are the advantages to the things you're purchasing? Sorry if it's a silly question.