These 'CX 300-II' in ear headphones from Sennheiser have superior sound quality and noise isolation, delivered with an impedance of 16 ohms, a 113 dB sound pressure level, a frequency response of 19-21000 Hz and a snug-fitting ear canal shape.
No. 1 best-selling headphone in Europe
ear-canal phones with dynamic speaker systems for powerful, bass-driven stereo sound
Excellent fit in the ear canals and high attenuation of ambient noise (ear adapters in different sizes included)