Sennheiser CI1 instrument cable for wireless transmitter (evolution series).
1/4″ jack input cable from instrument (guitar or bass) to 1/8″ locking minijack for Sennheiser bodypack transmitters.
Works with G4 or the older G2 and G3 series, plus Evolution D1 series digital wireless.
Suit SK100 and SK500, SKD1-NH.
CI1 is a genuine Sennheiser accessory / spare.