SFP PLUS PASSIVE have below Features:
Copper SFP cable data transmission.
Re-designed pull latch.
Improved backshell design.
Identical mechanical dimensions as standard SFP.
Available in passive and active designs.
EMI girdle.

Benefits:
Meets customer requirements for speeds up to 10 Gbps up to 25 meters.
Enable belly-to-belly cable use.
Ensures highest possible port density.
Conforms to (SFF)8431 specifications.
Highest quality design features ensure trouble-free operation.
Enables backwards compatibility.
Provides system design flexibility.
Minimizes design requirements in the host, enables "optical module" performance
Extended reach to 25 meters.
Inexpensive 10 Gbps interconnect.
Provides superior EMI performance for up to 10 Gbps transmission.