The Bluetooth connection is easy to set up and it has never cut out on me once! The headphone jack didnt work. I?m about 5?1? & weigh 180 lbs. My granddaughter loves this book They seem to have been handled poorly and just thrown in a box with no care at all. Road noise and such really made it hard to focus on the callers voice. **UPDATE** If you work in your feet all day seriously Buy These! Give it a try and you will not regret for buying these. He querido resumirte lo mejor y lo peor, por qué esta pulsera es para ti o por qué no. The second one, which I ordered after assembling the first to make sure it was what I wanted, didnt have any of the hardware needed to assemble it.