We are offering tracking devices.Specificationcpu: arm 7 tdmi processor, 4 serial portsnon volatile memory for data storagegps : l1, 1575.42 mhz ; ca code, without aid: 3.0 m (50% cep)gsm : quad band, multi-slot class 10125 khz rfid readera capacitive keypad with 4 switchesa 3.5" color display7200mah battery for long operation without powerinterface for serial camera - take snap and send to serverinterface for taximeter, serial printeradditional serial iointerface for barcode credit card reader