Sennheiser 
Sport Earphones MX 686G Sports

Durable Ear Bud headset designed for those with an active lifestyle
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
Hybrid ear adapters for enhanced bass response and greater situational awareness and safety
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

Speficications
Impedance : 30 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
Sensitivity as per 121 : TR 9-5 –44 dB V/Pa