I find the naming of Eagle Eye models a bit confusing.
for instance,
the EE X2R and X2 appears to be very similar lights (both look very similar to Convoy S2+), the “R” version having an addition of micro-USB rechargeable port.
the EE X6 and X6R also look similar physically, although the “R” version adds not just a micro-USB rechargeable port but also a side switch.
the EE X1 appears to be an AA/14500 light (in the style of Thorfire TG06S or Sofirn SF14),
whereas the EE X1R looks totally different (angle-head light) — taking 18650/18350 batteries.