For sale, an Etymotic ER4P and also the conversion cable for making this into an ER4S (a $44 value). The P is the high-efficient "Portable" version for iPods and such, and the S is the more even response curve for home listening with an amplifier. Other accessories include two unused pairs of flanged tips, two unused pairs of memory foam tips, two replacement filters, the filter replacement tool and a manual. It also comes with the storage box that can hold all the accessories, and a small case for transporting the ER4 itself.
Shipping is free to US destinations Buyer pays 3% paypal fee.