... GPRS and SMS ; Voice Headset Kit AvailableMessages SMS, Encrypted Protocol ; GPRS, TCP/IP over PPPGPS module Holux M89 or ... alarm, Anti-theft alarm, Power discarding, GPS antenna shourt circuit, GPS antenna open circuit, GPS receiver failure, illegal ignition, illegal door- ... valid location, and current operating mode of the GPS.Miles by GPS Advanced algorithm to calculate the vehicle's mileage ...