ELM327 interface is able to detect and interpret obd2 / eobd protocols automatically. It also provides support for high speed communications and a low power sleep mode. It use AT commands to communicate with a host device (PC, notebook, for iOS). There are plenty of software packages available, which are fully compatible with this tool. Some of them have pretty useful features, such as engine running parameters monitoring, DTC reading and clearing, MPG meter, etc. You can even write your own software on a specified hardware platform if you wish, because the AT commands are fully documented and very well explained. This tool is only 2.7 x 1.25x 0.9 inches, and it comes with a 6 ft OBDII cable for easy installation. It also includes a power switch built-in to prevent the need for having to constantly disconnect your unit from the OBDII port. It is compatible with 1996 and later vehicles which are obd2 or eobd compliant. Connecting to your iPhone / iPod touch is made by WIFI connection in adHoc mode. Features: *Firmware Version V1.5 (Supports more protocols SAE J1850 than V2.1).*With chip:PIC18F25K80 ,supports all elm327 fucntions,in program ELM327 identifier,it shows full functions.It understand commands such as ATPPS and other. The frequency of the crystal oscillator is 4mHz.Main Functions: With proper software installed in the host device, you may have following parameters read out from your vehicle:Vehicle SpeedRPMFuel ConsumptionEngine Coolant TempFuel PressureCalculated Engine LoadThrottle PositionIntake Manifold PressureAir Intake TempTiming AdvanceMass Air FlowFuel LevelBarometric PressureEVAP System Vapor PressureFuel TrimundefinedNote:Your vehicle may not support all above parameters.How many parameters you can get is depended on the vehicle manufacturers implementation. Support Protocols: 1.SAE J1850 PWM(41.6Kbaud)2.SAE J1850 VPW(10.4Kbaud)3.ISO9141-2(5 baud init,10.4Kbaud)4.ISO14230-4 KWP(5 baud init,10.4 Kbaud)5.ISO14230-4 KWP(fast init,10.4 Kbaud)6.ISO15765-4 CAN(11bit ID,500 Kbaud)7.ISO15765-4 CAN(29bit ID,500 Kbaud)8.ISO15765-4 CAN(11bit ID,250 Kbaud)9.ISO15765-4 CAN(29bit ID,250 Kbaud)Supported cars: If your vehicle does not fall into any of the above categories, look under the hood and try to locate a label that explicitly states that the vehicle was designed to comply with OBD-2 legislation. This elm327 usually can work on most new car with OBD 16pin Aadapter and 12V engine:For USA Car brand,after 1996;For Europe Car brand(petrol),after 2001;For Europe Car brand(diesel),after 2004;For Japan Car brand,after 2002;For Korea Car brand,after 2010;For Chinese Car brand,after 2009;For Indian Car brand,after 2010;For Russian Car brand,after 2012;undefinedSoftware Requirements: All ELM327 based software.- IOS system software in Apple store: Car Scanner / OBD Auto Doctor / OBD Car Doctor / EOBD Faciles / Rev / FUZZYCar/ DashComand / SpeedPORT / Nova Scan ...Attention:For iOS base software are not included you must buy from Apple App Store!- Android system softwareTorque pro / Mini OBD2 / OBD Car Doctor / DashComand ...- Windows system: Scanmaster- ELM / PCMSCAN...