The Sennheiser CI1 (005021) is a 1/8" (3.5mm) instrument/guitar cable that allows you to go from 1/8" to 1/4" when used with Sennheiser Evolution Series transmitters (EW).
Features:
• 1/8" (3.5mm) male plug with twist thread on one end
• Ends at the straight male end 1/4" from the other
• Perfect for instrumentalists using Sennheiser systems