With proper software installed in the host device, you may have following parameters read out from your vehicle:
Vehicle Speed
RPM
Fuel Consumption
Engine Coolant Temp
Fuel Pressure
Calculated Engine Load
Throttle Position
Intake Manifold Pressure
Air Intake Temp
Timing Advance
Mass Air Flow
Fuel Level
Barometric Pressure
EVAP System Vapor Pressure
Fuel Trim

Specifications:
Range: 50 ft (Line of sight)
Antenna: Internal
Power Consumption: 0.75 Watts (With Power Switch)
Wifi Standard: 802.11a/b/g
Operating Temperature: -15 to 100 Deg Celsius
Plastic: Automotive Grade
Dimensions: 2.75 x 1.25 x 1.2 inches
Connection Type: Wifi

What's in the box
1 x Diagnostic Tool