Features:
ELM327 USB is the latest PC-based scan tool. It supports all OBD-II protocols and is dispatched with a number of compatible programs. The processor is an ELM327 USB. The output protocol (connection to laptop) is USB. 

OBD-II Protocols: 
ISO15765-4 (CAN) 
ISO14230-4 (KWP2000)
ISO9141-2
J1850 VPW
J1850 PWM

Output protocol: RS232
Baud rate: 9600 or 38400
Indicator LEDs: OBD Tx/Rx, RS232 Tx/Rx, Power
Operating voltage: 12V, internal protection from short circuits/overvoltages
Nominal idle current: 45 mA

Description:
OBD-II Software for ELM327 USB is a free program that allows you to use your PC and a hardware interface to get the information from your car’s computer.

The program is very user-friendly, and easy to learn. It is also very easy to install: simply extract the files into a folder on your computer’s hard drive, and you’re ready to go. To uninstall the program, simply delete the entire contents of the folder where the program resides.

The software supports two platforms - DOS and Windows.
 
The program lets you perform the following operations:
 Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database).
 Clear trouble codes and turn off the MIL ("Check Engine" light)
 Display current sensor data, including: 
 Engine RPM
 Calculated Load Value
 Coolant Temperature
 Fuel System Status
 Vehicle Speed
 Short Term Fuel Trim
 Long Term Fuel Trim
 Intake Manifold Pressure
 Timing Advance
 Intake Air Temperature
 Air Flow Rate
 Absolute Throttle Position
 Oxygen sensor voltages/associated short term fuel trims
 Fuel System status
 Fuel Pressure
 Many others...
 
Upcoming Features: 
Data graphing and logging
Freeze Frame data
Continuous and Non-Continuous Oxygen Sensor test results

Free software:
GM Mode 22 Scan Tool by Terry 
OBD Gauge for PalmOS and Pocket PC by Dana Peters 
OBD Logger by Jonathan Senkerik 
OBD-II ScanMaster by Wladimir Gurskij (ScanMaster 3.52 - local copy) 
OBD2 Scantool by Ivan Andrewjeski 
OBDII for ELM322 by David Huffman 
pyOBD by Donour Sizemore for MacOSX and Linux 
RDDTC by Pete Calinski 
Real Scan by Brent Harris 
ScanTest for Pocket PC by Ivan Ganev aka a-ser 
OBD by WDT

FAQ:
Q: What is the difference for the v1.5 elm327, the plastic elm327 and the bluetooth elm327?
A: There are the same functions for them, the only different is the interface: the v1.5elm327 has both USB com interface, the plastic elm327 just has USB interface, and the bluetooth elm327 just has no cable, it works by the bluetooth.

Q: I can not connect on any of the com port settings, how do they do?
A: If you encounter this problem please contact us. We will send an instruction file to solve this problem.

Q: What is the difference among ELM327 (plastic) elm327 (metal box) and bluetooth elm327? Can they update?
A: For these three kinds of elm 327 they have the same functions. The only difference is the interface. The plastic elm327 just have USB interface; the metal box elm327 has two interfaces. USB interface and COM interface; the bluetooth one doesn't have any interface, it works by the bluetooth. For these elm 327,they all can not update.

Q: Can elm327 do his cars?1) 1997 GM Saturn 2) 1998 Toyota 4Runner 3) 2000 Didge caravan.
A: The available cars and unavailable cars are all listed in details on our website, you can check it on our website, if you can not see your car type, it means it can not do your car

Q: What is the version of software and hardware for elm 327?
A: The version for software is 1.12v,and the version of hardware is 1.5v.