... based service)12. LED Advertising Screen, RS232 Printer, Temperature sensor, RFID (optional) Positioning and tracking: through the online ... the receivers end with the mobile cell phoneAuto track: Auto track by SMS or online positioning platform; Mileage statistics ... Max<500mABatteryLithium battery :400mA( working time is about 3.5 hours)AccessoriesDevice, Connecting cable ,GPS antenna ,GSM antenna, ...