This ex-demo Sennheiser EW IEM-G4-TWIN (Range GB) Dual IEM System, Is in an excellent condition as well, it comes with 6 months warranty.
Sennheiser In-ear Monitoring
The Sennheiser EW-IEM-G4-GB system is a two-piece kit that includes two belt packs and two pairs of IE4 earphones, as well as a single SR-IEM-G4-GB transmitter.
Sennheiser in-ear monitoring systems are more frequently used in live events where musicians need to hear a feed for reference. They can also be used in conferencing and lecture halls.