The first batch of Skylumen Tanges experienced a relatively high failure rate (~5-10%) and the pulsating/breathing tail LED indicator had a high current draw which if left On continuously would drain the tiny 10180 battery in 5-7 hrs. Skylumen made good on any outright failed units (the high drain pulsing LED was not considered a failure though) and decided it was not ready for further release.

But that was the Tange, not sure if Rofis’ model has been tweaked.