Hello,
I just got home Convoy S2 FastTech!
Convoy S2
I thought it was complete (ready to use) 
I have 18650 batteries that I use for Electronic Cigarette
but I see that I need to buy other accessories …
could someone tell me what to buy and do it is complicated to assemble
if there welds
thank you
Sorry for my english (google translation)
Hi and welcome to BLF!
you bought a “Host”
in the title of the produch pace you can read:
(i made the importent parts bold ;))
you will have to solder wires to the LED MPCB and the driver also…
(others can tell you which you should choose better than me )
looks like you can fit a LED up to 15mm and a 17mm driver
i like that driver: 8* AMC7135 2-Group 2~5 Modes LED Flashlight Driver (Nanjg 105D)
LED could be a XM-L2 - you can choose the tint (“lighttemperature”) from ColdWhite over NeutralWhite to WarmWhite…
Thank you for the quick response!
I ordered without thinking
for less!
I understand that it takes $ 15/16 for a complete lamp …
I do not feel myself able to weld!
20/25 and then waiting days
I explain to them and try to turn their lamp
thank you
Nice looking host there
Bummer. Good thing you weren’t ordering a new bride online and ended up with something worse than half a flashlight! 0:)
With a very good driver, you can put a triple in that (with the spacer from RMM) and have one HECK of a little pocket rocket 
Driver and emitter should be $10 - $12, you could even add an AR lens for around $3 and you would have the same package of parts I have on order
If you don’t feel comfortable doing all the work yourself, just order the full light (they are $15). Later when you’re more comfortable (after spending hours and hours on this forum) you can hotrod your spare host.