The Quad-Driver Westone W40 earphone will take your listening experience to an entirely new level. Four balanced armature drivers and a three-way crossover network deliver breathtaking clarity and realism. Westone�s True-Fit technology provides superior ergonomics and comfort.

SENSITIVITY: 118 dB SPL @ 1 mW
FREQUENCY RESPONSE: 10 Hz - 18 kHz
IMPEDANCE: 31 ohms @ 1 kHz
PASSIVE NOISE ATTENUATION: 25 dB
DRIVER: 4 balanced armature drivers with a 3-way crossover.
WEIGHT: 0.445 ounces/12.7grams
CABLE: EPIC Replaceable cable and MFI G2 cable
CABLE LENGTH: 50" / 128 cm