Thumb Score: +10 1.Emitter: 4* high quality LED 2.Operating voltage: 3.0V-4.2V 3.Beam Angle: Narrow beam 32°; Flood beam 86° 4.Battery options: 1x 21700 Li-ion Battery 5.Dimension: 122mm (length) x 35mm (head diameter) 6.Weight: 108g / 0.24lb(excluded battery) 7.Reflector: TIR lens 8.Circuit Type: Boost constant current driver 9.Reverse charging function: Yes 10.Flashlight body: Aerospace grade 6061 grade aluminum alloy 11.Water resistance i.a.w.