A chemical property is a characteristic of a pure substance that describes its ability to change into different substances. For example, a chemical property of methane is that it can catch fire and burn in air. Physical properties can be observed or measured without changing the composition of matter.
The downsides are obvious: Almost everyone has headphones, speakers, and other gadgets based on the ubiquitous 3.5 mm headphone jack. Eliminating this connection could render these devices unusable, or at least force everyone to carry around an extra adapter. But Apple doesnât care.
1 Ensure that there is no audio cable plugged into your headphones. 2  The Bluetooth LED on the left earcup will blink, indicating that you are in pairing mode.3  Connect to your headphones with your phone or music player. Ensure that there is no audio cable plugged into your headphones. 2  The Bluetooth LED on the left earcup will blink, indicating that you are in pairing mode.