66 Audio BTS Pro vs AfterShokz Trekz Titanium

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.

The sound that these headphones produce is comparable to in-ear headphones, so you'll be able to get a good listening experience. These can also connect to two devices simultaneously via Bluetooth, so you'll be able to switch to different audio sources on the fly.

It'll be easier for you to switch between the Trekz Titanium's audio sources. These headphones can connect to two devices at the same time, and you can switch between sources at the press of a button. Other wireless bone conduction headphones can only connect to one at a time.

These headphones are built really well and should last you many uses. The transducer housings are made of high quality plastic, while the neckband features a titanium core with a silicone coating, so it is durable, lightweight and fairly flexible.

These headphones will not put any strain in or on the ears. These sit just above the area of the ears when worn which could help minimize discomfort.

The connecting band is thin and light, and both transducers are quite small so not much weight will be applied to a user's head.

The flexible connecting band accommodates a wide range of head/neck sizes. This minimizes pinching or discomfort yet can stay securely on the head.

These feature an integrated microphone. At the press of a button on the in-line remote, you can answer phone calls which is very convenient.

You can opt to use the included earplugs with these headphones. This will result in a music listening experience that is quite similar to traditional earphones where some of the ambient sound is blocked out.

While the headphones advertise a 6-hour battery life, they can easily surpass that threshold if you don't listen to them at full volume.