Best iPhone accessories for teens?

[iMore Question]

Specifically, accessories for an iPhone 6 because that's what my son has... but universal or generic iPhone things would be cool too. Just trying to think of some Xmas presents or birthday because that's coming up soon too. Thanks in advance if anyone has ideas!

 

[TripleOne]

Apple Watch or AirPods

 

[robertk328]

The  Watch or AirPods would be a good idea, because they will work with other iPhones if he upgrades at some point. Bluetooth speakers are another -- they make nice ones (for not that much) that have battery power and sound good. Bought 2 of these last year and they're perfect.