Definitely worth paying a bit extra for headphones that are exceptionally comfortable and have fantastic sound and build quality! These wireless in-ear headphones by Sennheiser are the CX 6.00BT which insert inside the ear canals, giving you a high degree of passive isolation.
The Sennheiser CX 6.00BT build quality is top notch featuring aluminum nozzles with a sleak black and blue high gloss finish on the body. The rubberized back of the CX 6.00BT earphones feature a holographic Sennheiser logo.
Size wise, the CX 6.00BT earphones have a very compact, small footprint weighing only 14 grams which is remarkably lightweight.
Thanks to the low weight and small size the CX 6.00BT sit nicely on the notch of the ear while the angled nozzles help the earphones stay securely inserted inside the ear canals.
As mentioned earlier, the CX 6.00BT earphones are wireless so instead of plugging into the 3.5mm audio socket of your phone you pair them via Bluetooth connection.
The CX 6.00BT earphone use the latest version of Bluetooth, version 4.2, which provides more stable Bluetooth signal and longer battery life.
Talking about battery life, the CX 6.00BT headphones have a 6-hour battery life via a lithium-ion polymer rechargeable battery that takes only 1.5 hours to fully charge via fast charge technology which adds 15% of battery charge in just 90 minutes.
The rechargeable battery is located in box compartment separate from the 3-button remote which also integrates a very good microphone for hands-free calling.
The inline remote, which has a nice robust build with tactile and responsive buttons drapes around your jawline, which is just about the perfect height you want the inline remote microphone to be.
The total cable length of the CX 6.00BT earphones is 60cm from earphone to earphone so you get a generous cable length that won't feel tight on the back of your neck. You do get also a tiny cable management slider to adjust the cable length to your liking.
With the CX 6.00BT earphones you also get ear tips in four sizes (XS, S, M, L), a 10cm long micro USB charging cable and the plastic box that the earphones come with which doubles as a nifty carry case for storing the earphones and ear tips.
As far as sound, the audio quality you get with the CX 6.00BT earphones is superb and on par with the CX 7.00BT and Momentum Free which feature a frequency response that ranges between 17Hz and 21,000 Hz and allows for audio with clear high end and bassy low end. You also won't have to worry about volume levels as you can turn the sound pretty loud on the CX 6.00BT earphones.
Another nice integration you get with the Sennheiser CX 6.00BT earphones that most earphones don't feature is the aptX LL codec which cuts latency below 32 milliseconds, making lagging issues non existent. The "LL" in aptXLL stands for "aptX with low latency" integration which is a codec you normally find in gaming headsets for keeping audio and video perfectly in sync.
Other cool features you get include multi-connection support that allows you to pair the CX 6.00BT earphones to two devices at the same time, and 3-way calling support so you can add a third person to the phone conversation, which is pretty neat.