The device is very durable. I have been using this gadget for the past four years. It is working as efficiently as it worked before. It has intelligent in built sensors which can control the amount of current required for charging a particular device.
Bought for present for hubby, He loved them, came bought and bout 3 more for present to gift. I would highly suggest these, and they cancel out noise and if you have a youngster or spouse plays loud music, these work, I can not hear either one of them with their loud music.
I enjoy using this daily so I can speak with my wife hands free while I work. The volume is not as loud as I would like it but I do have some hearing loss due to the type of work I perform.
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