Features:

The CX 500 are high quality, noise-isolating ear-canal-headphones with a superior , bass-driven stereo sound. They feature a volume control integrated in the cable and come with a new, unique type of ear adapter for an improved fit and even better passive noise attenuation.
Features
l         Ideal for use with all MP3, CD, DVD players and portable gaming systems
l         Best bass experience and noise attenuation
l         High-performance dynamic driver systems for superior, bass-driven stereo sound
l         Highest passive attenuation of ambient noise
l         Outstanding wearing comfort on the go
l         Superior fit in the ear canal due to enhanced ear adapters in different sizes (supplied as standard)
l         Extremely small and lightweight
l         Volume control integrated into the cable
l         Cable clip, cable winder, and carrying pouch for convenient handling and storage

Specifications:

1.         Design High quality: noise-isolating, ear-canal-phones
2.         Transducer principle: Dynamic,close
3.         Frequency response: 17 – 22,000 Hz
4.         Impedance: 16 O
5.         THD: < 0.2 %
6.         Sound pressure level (1 kHz, 1 Vrms): 113 dB
7.         Weight (without cable): approx. 4g approx.
8.         Connecting cable: 1.0 m
9.         Plug: 1/8 in. plug (angled)
10.     Packaging: Blister packaging with hanging eyelet
11.     Packaging dimensions (W x H x D): 4 x 2 x 9

Packing includes:
 Sennheiser CX500
1 X set of enhanced CX ear fit adapters (S/M/L)
1 X cable clip
1 X cable winder
1 X carrying pouch