Specifications:

BRAND NEWHIGH QUALITY!Works with VCDS Lite & Windows 7 (VAG-COM 409.1 may not run on Windows 7 64 bit)
VAG-COM USB KKL 409.1 Cable for AUDI & Volkswagen - OBD2 / OBDII
This diagnostic cable is used only for ISO9141 and KWP2000 transmission protocols which are used by:

Volkswagen 
Audi 
Skoda 
Seatolkswagen Audi 
Skoda 
Seat
This cable may not work if your car uses a protocol / bus system like VPW, PWM or CAN-bus. 
2. Terminal K = Bus of communication 
3. Terminal L = Ignition for waking up car computing system (ECU: Engine Control Unit)
4. Existed 3 different protocols with same OBD2 connector incl. ISO/KWP, VPW, PMW 
5. This K/L Diagnostic interface & cables work on ISO/KWP (Key Word Protocol) launched after 1996 only. 
6. Supports also ISO9141 protocol