I started using this sleep mask 2 months ago and Ive been sleeping great! I was blown away by how good and balanced the sound quality was when I first used the speaker. Easy to cut and stick good I have an LG v40 by T-Mobile cell phone and the headset wire works fine for the cell phone but when I try to plug it into my Xbox One S controller did not work at all ? It was purchased for my friend and she is happy with it. This has been an annoyingly self-serving review. I stupidly looked at the photos showing a regular foot symbol on the sandal. Or you to them, if you are the unfortunate person who has to affix this rail. So decided to keep it. Yes they are expensive (shoes) but they are worth it!