Sennheiser PMX80 Sport Stereo Headphones with Neckband 

 The PMX 80 Sport II headphones give you the optimum fit and comfort of an ergonomic neckband and vertical transducer system. Their sweat-proof materials are built to handle indoor and outdoor sports with ease.

Features
Ergonomic neckband system for the best possible fit
Powerful neodymium magnets for balanced, detailed sound reproduction
Sennheiser Basswind System delivers powerful bass response
Meticulous construction for serious durability
Reflective neckband to ensure extra visibility and safety outdoors
Sweat- and water-resistant materials
Washable under running water
Single-sided cable clip                                                                                                                                                                                              

Specifications
Nominal impedance: 64 Ohm
Jack plug: 0.14 in./3.5 mm stereo, right angled
Transducer principle (Headphones): Dynamic
Frequency response (headphones): 19Hz to 21 kHz
Mac spl: 121 dB (1kHz/1Vrms)
Thd: <0.1%
Weight (without cable): Approx. 0.56 oz./16.0 g
What’s in the Box
PMX 80 II Sport headphones
Cable clip