C8 Flashlight: Made of Aluminum alloy Cree T6 led Bulb 5 Mode: High, Medium, Low, Strobe, SOS (Half push the tail button to change modes) Size(mm): approx Size: 146( length ) x 44.7( head diameter ) x 25( body diameter ) Powered by : 1 x 18650 3.7v Battery (DO NOT use 2x CR123A batteries) UltraFire 18650 3.7v Li-ion Battery Brand: UltraFire Voltage: 3.7V Capacity: 3000mAh (high capacity) Chemistry: Li-ion (Lithium Ion ) Dimensions(Dia. X H): 0.71 X 2.6 inch / 18 X 65 mm Single Slot Battery Charger Automatically stops when charging is completed Red light: Charging Green light: fully charged or no battery Input: AC100-240V/47-63HZ Output: DC 3.7V / 450mA Termination Voltage: 4.2V+-1% Compatible with 10440, 14500, 16340, 17335, 17500, 17670, 18500, 18650 batteries