The device's battery life (when in use) as given by the manufacturer. With a longer battery life you have to charge the device less often.
Sennheiser PXC 480: 50h
17. has an on-ear form
This device comfortably rests on top of your outer ears. As it doesn't block out everything from the outside world, it's preferred in places like office environments and recommended for outdoor activities.
Beats Solo 3 Wireless
22% have it
18. warranty period
When covered under the manufacturer’s warranty it is possible to get a replacement in the case of a malfunction.