66 Audio BTS Pro vs Phiaton BT 100 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 get a lot of useful features from the BT 100 NC which includes decent noise cancelling, Bluetooth as well splash resistance, which makes these earphones great for casual or active use. Sound reproduction has great clarity as well as full mids and okay bass, and should work well with many music genres.

Bass is not emphasized yet is full and has good punch so the sound does not sound lean. The mids are warm and full, so guitars, vocals and drums sound great. The highs are slightly emphasized, which brings out a lot of detail from the music, but can also make cymbal and “s” sounds quite harsh.

You’ll be able to control the various earphone functions using the buttons and switches on the BT 100 NC’s collar. It houses the earphones’ battery and noise cancelling circuitry along with the buttons for answering and ending calls, play/pause/skip/previous tracks, volume adjust and the noise cancelling switch. Aside from being easy to reach, the collar also takes as much weight off of the earpieces as possible, so they stay inside the ears well.

You’ll get a good amount of wireless listening time off of these earphones. Battery life with noise cancelling and wireless activated is around 8 hours, while you can get 12 hours of noise cancelling when these are used in wired mode.

While not the best, the noise-cancelling is decent and can reduce noise that may mix in with your music. You’ll still be able to hear some low pitched noise like the sound of engines though.

You can bring these earphones on the go without the earpieces flopping all over the place when they are not in use. There is a space in each end of the collar where you can dock the earpieces for easier transport.