so they “know” when they are in your ears; the range is awesome, at least 25 feet and 2 different floors from phone; different sizes for different sized ears; very securely in place of jumping or running during exercise routines; they can operate separate of each other, left and right and a cool looking charging box and carrying case

I was skeptical at first, but after charging and pairing was quite happy with the sound clarity and also the battery life

I love the charge that they get