even within three feet. However, all of the Pinterest versions, save one, seemed convoluted and a bit expensive. The only concern that I have is that they are not leather, but another material that I fear may scuff easily after being worn. However, Im just going to hold on to the piece I got online as it does the job and a replacement is an unnecessary burden on the planet! Excellent Customer Service team with a vast array of knowledge and experience. Pairing with phone is very intuitive, I did it right out the box without reading the instruction. Unfortunately I have to return it even though I really like the look of the shoe. I have capsulitis of the 2nd toe (pain in the ball of my left foot), especially painful when walking barefoot on our hardwood floors. We returned them. The only reason you need the USB is for the RGB lighting so if you really wanted to use it you could just use a Power bank.