The Mic is part of the Viper Proximity Sensor. This is an optional upgrade to the Viper 5900 Responder SST 2-way with Remote Start. The Mic is very sensitive, all I have to do is bend over a little and speak. There is a button on the back that engages the Mic. It is very clear. This system will speak with prerecorded message or your custom messages when the system is armed. I had the whole thing installed by a local shop, it is sophisticated installation and the manufacturer will only honor the $2,000 warranty if it is installed by certified personnel. I hope this answers any questions. I it is not cheap, the Viper 5900 cost $599 and the Proximity Alert upgrade is another $199.99 less instillation. I also have another upgrade which is the Digital Tilt Motion Sensor, cost $80. This will activate if someone were to try to tow or lift the truck in order to steal my wheels and tires. The benefit of this system, besides peace of mind, is the reduction on my insurance policy.
http://www.viper.com/P-516L/Programmable+Voice+System
Yes I do have the optional 508D Radar sensor.