Three different casette adapters are scattered on the back seat of my car - one XM, one Sony, one RCA, all thrown back there in disgust after they started spontaneously popping out of my cassette player and/or squeaking and rattling at intolerably high decibel levels. I went looking for a higher quality unit for use with my XM radio. I considered one by Monster but read bad reviews; finally settled on this one and I'm very happy with it after two weeks. It's silent, it stays put, and its coiled cord and and two-way plug show a little imagination in design and care in manufacture. If it starts squeaking I'll let you know.