I'm looking to buy car GRP trackers. I need them to: - have SirfStarIII cipset - 900/1800 Mhz GSM compatible (be able to work with any sim card) - send data every x seconds to an IP address I need the following info with your offer: - does your tracker require an external antenna(if yes, is that included in the package) - can it work directly by car battery and/or 12V car jack. - can it be mounted under the truck/car/bus - does it have to be mounted in a place with visible sky - what other functions does it have: voice communication, send data only when I send it an sms, speed monitoring I also need to know in what format is your gps tracker sending the information to my server, and what info does it send. A text file attachment or a PDF file with the documentation of your GPS tracker would be nice to have. Don't forget to mention PRICE, minimum order and if it's possible to have a test device (we will pay for it, including shiping carges).