I have these with the adv sound earbuds and... I guess I wouldn't get them again. The cord is tough to manage and the connection isn't great. I do enjoy the sound and I thought it would be a really flexible system to get, but day to day use gets frustrating. Battery lasts a while.
JmikelittleBluetooth connection is dependent on source as well as the device itself. Additionally the low battery affects the connection stability, so please make sure to keep them charged if you are experiencing connection issue. We are using a reliable CSR8645 solution that has been optimized over several years in our application. If the connection issue persists, please contact us at support@adv-sound.com.