Size

8cm x 4.3cm

3.5cm x 4.3cm

6.7cm x 4.3cm

4.5cm x 4.3cm

Firmware Version

1.3/1.4v

1.5v

1.3/1.5v

1.5v

Pros

-

Smallest in size

With LED Indicator

Contains new implanted OBD2 chip.

Cons

Large in size

Switching other obd2 devices causes bluetooth confusion.

Get hot easily due to the led indicator， can’t be used for long diagnose more than 5hours.

Slightly bigger 1cm compared to the mini ones.

Remarks

Big in size， would block the driver’s foot during driving， especially for those obd2 connectors located near to the leg.

Beautiful LED light indicator. Also means produces more heat and consuming more power.

Good for drivers with obd2 located near to the leg， does not obstruct driving， produces less heat.

However if you’re using other obd2 on other vehicles， your phone bluetooth connection will be confused， thus you’ll need to unpair connection and restart your phone again.

Not compatible with certain vehicle model.

LED indication is beautiful， but it means using up more power and higher heat produced. May damage your ECU if used more than 5hours.

Big in size， would obstruct driver’s foot during driving.

Bluetooth connectivity is fairly good.

Although slightly bigger than the mini ones， it still does not obstruct your leg during driving.

New elm chip provides the ability to diagnose more vehicles， including Peugeot 308T， stable voltage and much accurate PID readings.

Each obd2 device is separated with its own serial number， thus would not confuse your bluetooth connectivity whenever switched to another vehicle.