Sennheiser CX 475 Noise Blocking Earphone for $19.95 shipped after promo code EMCYTZT1412.  Here is a screenshot for your reference.  The earphone features neodymium magnets 6mm drivers, noise blocking, 19Hz to 20.5kHz frequency response, 120 dB sensitivity, 3.9-ft cord, and works with all 1/8" (3.5mm) headphone inputs.