Sennheiser 
Sport In-Ear Headphone with Microphone
CX 686G SPORTS

Durable, dynamic ear canal headset delivering full, rich sound while staying in place and taking what you dish out in your most strenuous workout.

Inline smart remote and mic on the cable are compatible with most smartphones and portable players (including Android, Windows Mobile and Blackberry devices)
Maximum ruggedness and durability – Sweat and water-resistant
Sealed in-ear-canal design for improved blocking of outside noise
Antimicrobial ear adapters (SteriTouch)
Slide-to-fit system is fully adjustable for an individualized fit
Para-aramid-reinforced cable provides superior strength and reliability
Oval-shaped cable ensures a tangle-free listening experience and reduced cable noise
Convenient storage pouch and cable clip included
2-year warranty
Included : CX 686G SPORTS/Storage pouch/Cable clip/Ear adapter set (S/M/L)

Specifications
Impedance : 20 Ω 
Frequency response : 18–20,000 Hz 
Sound pressure level (SPL) : 118 dB (1 kHz/1 Vrms) 
THD, total harmonic distortion : <0.5% 
Jack plug : 3.5 mm, angled 
Cable length : 1.2 m symmetrical cable 
Pick-up pattern : Omnidirectional 
Sensitivity as per 121 : TR 9-5 –44 dB V/Pa