Sennheiser CX680 Key features:

1,Sennheiser CX 680 Sports - Offering you the best sound experience and sports performance
2, Sweat- and water-resistant: ideal for sports
3, EarFin holding system: secure and comfort fit during workouts with cx680
4, Variety of ear-adapters (S/M/L) included: customize your fit!
5, High-output ear-canal drivers: energizing sound and high noise insulation
6, Acoustically closed - blocks outside noise effectively hence more recommended for indoor use
7, Dupont Kevlar reinforced cable: superior strength and reliability with CX680
8, Short cable for ease of use while running or working out with your player around your neck or on your arm; option of using extension cable with volume control
9, Practical accessories like cable clip and storage pouch included in the delivery of Sennheiser/Adidas CX680
10, Ideal for use with all MP3, iPod, iPhone (iPod and iPhone are trademarks of Apple Inc. registered in the U.S. and other countries), miCoach, CD players, mobile phones (3.5mm) and AV systems installed in gyms

 
Features
Fit Design    In-Ear only
Earpiece Design    Canal Earbud (In Ear Canal)
Sensitivity    120 dB
Frequency Response    18 Hz - 20 kHz
Impedance    16 ohms
Color    Black
Features    Closed Back, Volume Control, Water-Resistant
Connectivity Type    Wired