AAAA Battery required:
Cute battery which is pretty small, but does not spread and also the cost is high. Then prefer the slightly larger AAA that you get everywhere. At the rear, this increased diameter would not bother.
No Power switch:
Why do you not as a pen a power switch at the rear. So as to a ballpoint pen or a small slide switch. Thus, it is only when it is needed.
Also, I find it not so handy.
