A:AnswerThis product should be perfectly fine for rain and sweat but definitely try and avoid the rain and water. Semi water-resistant but not waterproof
A:AnswerThat would depend on the kid, they could work for a very responsible child, they are wireless, so some children might drop or lose one, others would respect the freedom of having them. However, they are like most other electronic devices, and can be lost or even destroyed by moisture.
A:AnswerYes I believe you can pair them with either one or both. If you get a phone call while listening to music on your computer, they should automatically switch to your phone.