A:AnswerYes. It can be synced to multiple devices. It connects to the last device automatically. So if you want to switch devices while connected you have to go into that devices bluetooth menu and request it to switch.
A:AnswerThe first time I tried to use mine it was too underpowered to stay on long enough to try it out. so it's recommended to charge it for at least 6 hours after opening.
A:AnswerI think it was about 5-6 hours of battery life. But I charge mine whenever I’m out of the car. So far no problems. Use it every day. Charges pretty quick. I leave mine o the charger when I’m at work.