4Sevens Quark "X" 123&sup2; Power: Two CR123A Batteries (3.0V~9.0V) LED Emitter: Premium Cree XM-L Runtime: Maximum - 1.7 hours; Moonlight - 25 days Battery: two lithium CR123A (3V) - do not use rechargeable RCR123As Seven output modes: Low, Medium, High, Strobe, SOS, Beacon (hi), Beacon (lo)