Sennheiser HD4.50 BTNC

Sennheiser Overview
The new closed-back Sennheiser HD 4.50 BTNC headset delivers everything required by a music aficionado with an active lifestyle. There’s the stunning Sennheiser sound and the latest wireless technology, all crafted in an elegantly minimal yet robust design, made from the highest-quality materials. But most of all, Sennheiser’s NoiseGard™ active noise cancellation lets you enjoy your music in peace – everywhere.
 â–º Your music. Nothing else.
 â–º Great sound. No strings attached.
 â–º Simple never sounded this good
 â–º Comfort on the go
 â–º The joy of a long-lasting battery
 â–º Timeless design
 â–º 2-year warranty
Impedance : 18 Ω 
Frequency response (Microphone) : 100 - 10,000 Hz 
Frequency response : 18 - 22,000 Hz 
Sound pressure level (SPL) : 113dB (Passive: 1kHz/1Vrms) 
THD, total harmonic distortion : <0.5% (1kHz/100dB) 
Pick-up pattern : Dual omnidirectional microphones 
Battery Specification : Li-ion Polymer Battery 
Codecs : AptX