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The size of the case fits in the palm of the hand so maybe that says more than saying what size they collapse to.
13.5x8.5x5cm is the size of the hard sided zip up case that is supplied and they fit in this with no problem.
Rather than press evenly on the ear they fit on where they touch which is the side away from the hinge so not perhaps the best in very noisy environments as the ear can still breathe and therefore extraneous noises can penetrate.
The neckphones are 14cm from the base of the neck band to the earcaps. When stretched to parallel the earcaps are 12cm apart so while they will go further apart those with larger heads may find them tight to wear.
There is close to 90 degrees of movement for the earcaps on the frame.
The case has the same design as the neckphones mainly black with a lime green line other colours are available.
The controls are are all on the right earcap with the supplied USB charge lead fitting on the side of the earcap and the rest of the controls being spread around the back of the earcap.
I found these controls easier to use than a lot of others as the top and bottom part are slightly proud of the left and right sides.
The top oval is + and the bottom oval is -, the left side is back a track while the right side is forward a track the final piece of the round is the centre area is on/off. There are other duplicate controls to answer phones calls.
I found the Bluetooth pairing easy and quick to establish with all the devices I tried.
Sound quality was excellent in a quiet environment but as stated not my unit of choice on a noisy train, tube or bus.
While I normally test all Genres of music via a 3.5mm lead on an MP3 player that I keep just for testing purposes, here I loaded a range of files both MP3 and .WAV onto a Notebook with Bluetooth and tested the sound quality from there, I found no problems. I of course also tested Bluetooth on my phone but as few sensible people let their phone out of their sight the tests with the Notebook gave better distance before signal breakup than with a lot of Bluetooth devices, stated to be up to 100 feet.
There was a single card of diagrams for setup and charging instructions in the box and joy of joy no safety instructions but as the box was not new when it arrived the previous reviewer may have already incinerated them.
For anyone who travels a lot these may be suitable providing the places they travel are not noisy. The size is a plus and the build quality seems good.
I am told they are great for running and working out and as they hold tightly to the ears I can believe that.
They are stated to have a battery capable of forty hours between charges. I see from a video on the second link that they are also water resistant. For those using iOS a special App is available.
The BTS Pro are available from Amazon for £49.99 with free delivery.
https://www.66audio.com/bts-pro
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