The extension mechanism seems to work well but you have to twist hard to lock/unlock it. I ordered a size 11 but on comparing with other shoes/sandals that I have they proved to be barely a 9. Will have to state that I eating healthier, and this Chefman Air Fryer is the cook now, save for eggs and easy stuff. 5 - 7, I bought W7 - it fit perfectly. This case fits perfectly and seems like it will protect my AirPods very well. Works well with my HTC phone but does not with the phone I purchased it for the Landrum® IP67 Rugged Waterproof Power Bank Phone X6000 MTK6261 phone. Plus, again because there is no positive feedback when slide click, dont assume that unit is secure. 5 to show up so I can send them back too. Even with that I still found them a great purchase. I should have been more careful comparing my 2 different purchases!