Sennheiser HD4.40 BT

Sennheiser Overview
Sennheiser’s new closed, circumaural audiophile headphone, the HD 630VB offers an audiophile listening experience, with the bass sound that listeners demand.
 â–º You are listening to well-matured sound
 â–º Strong ties that will free you
 â–º Control is all at your fingertips
 â–º Comfort to make you feel at home – everywhere
 â–º Style as clean as the sound
 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