66 Audio BTS Pro vs Phiaton BT 220 NC

The BTS Pro is quite robust and can withstand some minor splashes of sweat or rain as these are sweat-proof. They are not completely water-proof though, so you should not get them soaking wet.

There is good detail in the highs and the mids can also be heard clearly with very little muddiness. The lower frequencies are boosted, resulting in a good level of depth and power to each bass thump.

The BTS Pro ear cups sit on the ears with hooks keeping them in place. The flexible connecting band provides good clamping force and can adjust to your head size with continued use. Combined with cushioning on the cups, these are comfortable to wear and will stay in place.

Bluetooth connectivity allows the BTS Pro to connect with smartphones and compatible music players wirelessly, so cables won't be an issue.

66 Audio's Motion Control iOS App gives users added functionality, including EQ control and presets selection, battery status indicator, and even headphone position tracking. These features can improve the listening experience and also minimize the chances of you losing these headphones.

With up to 40 hours of playback time at full charge, it's more than enough for most listening sessions. You won't have to charge these frequently.

A hard shell carrying case is included, which can protect the headphones from minor impact and also make transport much easier. The case also has good aesthetics.

They are easy to bring on the go as the ear cups can be folded into the headband. This further reduces the already slim and compact size, making them easy to chuck into a bag when on the go.

The right ear cup of the BTS Pro features buttons for controlling headphone features. You can play/pause tracks, increase/decrease volume as well as answer/end calls by pressing the corresponding buttons, negating the need to pull out your phone to do so.

You do not need to take the BTS Pro off in order to answer incoming calls. There is a built-in microphone which allows you to easily take or make calls in the middle of your run or workout.

You’ll have minimal issues with headphone wires. While there is a cable connecting the earpieces to the active noise cancelling module, you can eliminate the need for a cable from the module to your source device if the source is Bluetooth capable.

These headphones can block out a decent amount of ambient noise. The active noise cancelling filters out most high and mid frequency noise. To further reduce low frequency noise, you’ll want to switch the eartips to the Comply foam ones.

Should the battery run out, you can still use these headphones in wired mode. There is a micro-USB to 3.5mm cable included so you can connect the ANC module to your source device. You won’t get active noise cancelling in this mode though.

The ANC module doubles as a remote, and gives you a lot of control over phone and music functions. There is a dedicated button for answering calls, a switch to turn ANC on or off, as well as buttons for volume adjustment and play/pause.