The MOMENTUM Free by Sennheiser are in ear headphones with magnetic earpieces that can be joined together and worn around the neck when not in use..
The MOMENTUM Free Bluetooth 4.2 headphones deliver wireless hi-fi sound via Bluetooth 4.2 and Qualcomm apt-X low latency, which greatly minimizes Bluetooth audio lag when watching YoutTube videos.
The microphone chip (aka MEMS microphone), which is integrated on the other side of the remote control features Bluetooth hands-free profile 1.6 wideband audio (a.k.a HD Voice) for high definition voice quality audio.
HFP 1.6 wideband essentially doubles the voice bandwidth from 3.4kHz (narrowband) to 7 kHz or higher. You also get Bluetooth Headset Profile (HSP 1.2), giving you the ability to ring, answer a call, end a call and adjust the volume.
The MOMENTUM Free built-in microphone really does a superb job at transmitting very clearly your voice, as well as delivering your voice fairly loud in both wideband and narrowband communications.
The MOMENTUM Free headphones also feature the latest versions of Audio/Video Remote Control Bluetooth Profile (AVRCP 1.4) and Advanced Audio Distribution Bluetooth Profile (A2DP 1.2), which further enhances the sound quality of the audio over Bluetooth.
With AVRCP version 1.4, you get all the benefits of version 1.3 which include status of the music source (playing, stopped, etc.) and track information (artist, track name, etc.), as well as absolute volume and media player browsing for multiple media players (including a "Now Playing" list).
The sound stage signature of the MOMENTUM Free is wide and natural thanks to a wide frequency response range from 15Hz to 22000Hz which allows for deep bass frequencies and detailed vocals and instruments.
The battery box is also located in-line but isolated from the rest of the unit. The battery box integrates a 85mAh rechargeable lithium polymer battery which powers the MOMENTUM Free for a good 5 hours on moderate volume.
Included with the Sennheiser MOMENTUM Free in-ear wireless is a luxurious leather case, different size silicone ear tips, 2- year warranty and user manual.