This is the Sofirn SP31v2. It has a single 18650 Li-ion rechargeable battery (included) or two CR123A batteries (not included).
It features 7 modes:
Eco-- Low --Medium--High--Turbo, hidden strobe and SOS. They are cycled by the side switch and the tail switch toggles power.
Specs according to Sofirn:
|Sofirn SP31 v2.0|
|Emitter||Cree XPL HI|
|2500 LM MAX|
|Beam Distance||225 Meters|
133.5mm (length) * 23.4mm (head)
|Weight||72±2 gram (without batteries)|
|Power Source||18650 or 2 * CR123A Li-ion batteries|
Aircraft 6061 grade-aluminum alloy