... SSC P7, Cree MC-E, or 3 x Q5/R5 LEDs in series 2. Boost constant current driver Input voltage: 0.7 ... -3.2V, work with 1xAA (1.5V), 2xAA(3.0V), 1xCR123A(3.0V)Constant ... : 700,1000,2000,3000mA optionalLED used: 3-6 or more LEDs in series 3. Buck-Boost constant current driverInput voltage: 0.8 - 4 ...