Sofirn SP31 v2 Kit With Battery & Charger
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:
133.5mm (length) * 23.4mm (head)
Aircraft 6061 grade-aluminum alloy