A:AnswerForget the earbuds in the device you don’t want it to connect to or you can also just turn off Bluetooth in the device you don’t want connected :)
A:AnswerNoise canceling is basically just a regular sound and a counter sound playing against each other to reduce the unwanted noise outside the headphones.
A:AnswerMine last about 4 hours or so. If you want to extend the battery life then download the app and turn off the noise canceling feature. This will extend the battery life.