The Etymotic ER-4 MicroPro by Proporta is the kind of earphones every audiophile dreams off. These new earphones have been designed to deliver the best possible audio quality and can be plugged into any audio source. They require no batteries and include noise isolation (33 dB with 3-flange ear tips, 41 dB with foam ear tips) technology which delivers unparalleled audio quality. The package includes ER-4B (Binaural) earphones, ER-4B earphones, ER-4S (Stereo) earphones and ER-4S earphones. This set is available for $354.95 and you can order it online here.

Specifications:
Frequency response: 20 Hz to 16 kHz ±4 dB
Acoustic polarity: + electrical = + acoustic
Transducer type: dynamic 1 kHz sensitivity (ER-4B/ER-4S): 108 dB SPL for a 1.0 volt input
Impedance (ER-4B/ER-4S): 100 Ohms nominal
Maximum output: 122 dB SPL
Maximum continuous input (ER-4B/ER-4S): 3.0 Vrms
Weight: less than 30 grams