Sourcingbay Remote Control Tk103B+ Dual SIM Car Vehicle Realtime Tracker for GSM Gprs GPS System Central Door Locking System Compared with 103a or 103b, this car gps tracker is a Upgraded Version 105A, which includes a lot of accessories. Comes with fleet management, central door locking and Dual SIM Card Slot function. Keep track of your car in real time with this versatile GPS tracker, 2 different SIM cards can be inserted. Please note: SIM card and others are NOT included. You'll be able to remotely lock the door of your car and lock anyone who is inside of the vehicle until you get to the car If using a GPRS enabled SIM card, you'll even be able to monitor real-time movement of your vehicle with the supplied software on your computer. On top of that, you'll also be able to record the audio inside the car using the detachable microscope. This GPS Car Tracker is the ultimate safety device for your car, van, truck, or even the entire vehicle fleet. This GPS trackers need to use a local sim card for 2G network, 850/900/1800/1900MHZ(sim card not included). Kindly notice: recently some sim card carrier have dropped 2G service, please confirm if your area can use 2g network sim card long time. Otherwise, please check the item description carefully before purchasing. thanks.