- Model: Ultrafire UF-H4 Head light
- Harden Type II Finish
- Powered by 1*CR123A/1*17670 batteries(not included)
- Max. 4.2V (2*RCR123A or 2*CR123A not recommeded)
- Features step-less birghtness adjustament, press and hold the button and LED brightness changes, release to lock down brightness.
- Double-click to enter SOS mode
- Adjustable head lamp strap
- Comes with a extension tube for 2 CR123A configuration
- Flexible head lamp strap to secure lamp on your front head
- Less "floodly" compare with with UF-H1, UF-H2B and UF-H3D
- Does not fit 18650 battery
- MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMt
This looks like manafont is confused and says don't use 2 cr123's or 2 rcr16340's
http://www.ultrafire-shop.net/UltraFire_Shop.php?view=productPage&product=90&category=10
My assumption is that the extention is for a 17650 which seems rather odd as well ...
...my guess is cr123 .16340 rechargable or a 17650 rechargable
https://budgetlightforum.com/t/-/1114
This is one clear reason to not buy ebay lights