Obd2 ELM327 Wifi interface is able to detect and interpret obd2 and 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, the devices such as PC, notebook, iPhone, iPod touch, iPad and so on.

Use your iPhone/iPod/iPad as an OBD2 reader. The portable nature of this type of OBD2 reader will enable the car owner to work around the car with the diagnostic information in hand. 

How to set up? Here is the Elm327 WIFI obd2 auto check - iOS Easy Setup Guide:

1.Wifi Settings
Search wifi -- Connect to device (SSID: OBDDevice)
Static Tab -- IP Address: 192.168.0.123 -- Subnet Mask: 255.255.255.0

2.Software Settings
Open Software (your iOS sofware (ex: Rev DashCommand, FuzzyCar )) 
Settings: Interface type : ELM -- Data Port : tcp://192.168.0.10:35000

This elm327 wireless scanner comes attached with a 6 fit OBDII cable for easy installation, included with a power switch built-in to prevent the need for having to constantly disconnect your unit from the OBDII port and compatible with 1996 and later vehicles. 

There are some information you should know about WIFI elm327 for iPhone/iPod/iPad, such as description, features and the parameters which could be read via wireless elm327. Please feel free visit obd2mart.jp, the professional will offer you more technical service.