The Olight ST25 Baton has a maximum output of 550 lumens from the Cree XM-L2 LED and is powered by 2 x AA batteries (alkaline or NiMH).

Powered by two AA batteries, the ST25 features two switches: The tail cap has Olight's new stealth switch that is silent in operation and also flat, allowing the light to tail stand. A separate side switch can be used to operate all brightness levels and also to lock the light to prevent accidental operation. Once the desired brightness level / strobe has been selected the mode can be remembered by turning off via the tail switch:

Brightness Levels:
Turbo: 550 lumens - 30 mins runtime (Please Note: Only achieved with rechargeable AA NiMH Cells)
High: 300 lumens - 1 hr runtime
Mid: 100 lumens - 6 hrs 30 mins runtime
Low: 10 lumens - 60 hrs runtime
Moonlight: 1 lumen - 200 hrs runtime

Plus Strobe Mode. 

Maximum beam distance 130 meters, waterproof to IPX-8 (2 meters submersible) and resistant to impacts up to 1.5 meters.

Includes: wrist lanyard, removable pocket clip, spare o-rings and 2 x alkaline AA batteries.