Benz compact 4 is a latest Daimler Chrysler wireless multiplexer. It will connect to the PC by wireless connection.
 
The system offers total diagnostic coverage of all engine, chassis and body systems:

Reading and re-setting of diagnostic trouble codes (DTC)
Real-time reading of dynamic data
Full component activation clearing and re-setting of adaptation values
Coding of all engine, chassis, body and instrumentation modules
Key configuration
Procedure for fitting Mercedes- Benz accessories through the D2B ring and MOST bus
Total ASSYST / ASSYST + control (Active Service System) to update on board service history
DAS: Concise interface and straightforward operation using a wintel computer you can realize a quick and accurate code reading and testing on the cars system.
Features:

Engines (All Gasoline & Diesel Systems)
Transmissions and Electronic Selector Modules
Airmatic and Active Body Control Suspension Systems
Traction Systems: ESP / ASR / ETS / ABS / BAS / SBC braking systems
Supplementary Restraint Systems (SRS) / Airbag, All body modules OCP / UCP / LCP / SCM / SKF / KFB / RCM / DCMs
Drive Authorisation System
Sam (Signal Acquisition) Modules
Electronic Ignition System (EIS)
Pneumatic System Equipment and ATA functions
Air Conditioning / climate control Systems
Instrument Cluster
Tyre Pressure Control
Parktronic System
Keyless Go
D2b Command & Audio Gateway (D2B and MOST networks)
TV Tuner
Headlamp Range Adjustment
Seat Electronics
Rvc, RST & Vario Roof modules
Automatic Clutch System ACS
M-Class Body Modules (AAM / EAM / DAS / SEM / VG Transfer Case)
Assyst & ASSYST + systems
Compatibility: All Mercedes Benz vehicles with OBDII