Compatible with 12 & 24V systems; plugs directly into the vehicles OBD socket. Can be used with meter probes or 2mm & 4mm banana probes - adaptors included. Selectable pin voltage digital indicator. Pin 16 is fused to protect diagnostic equipment from vehicle wiring errors. Protocol indicator lights on appropriate pins - Pin 6 = CAN H, Pin 14 = CAN L, Pin 2=VPW+, PWM+, Pin 10 PWM-, Pin 7 K_LINE & Pin 15 L_LINE. Instruction manual included.