[ ]br br UltraFire WF-501B Flashlight Style Red Laser Pointer (1*CR123A1*16340): 100mW 650nmbr br Manufacturer Specifications:br • UltraFire WF-501B flashlight style red laser pointer is great for pointing objects from long distancebr • This red laser pointer is power-saving, durable and reliable br • This red laser pointer is best suitable for astronomers, professors, teachers, doctors, student presentationsbr • Wave Length: 650nm br • Output Mode: Constant wave br • Laser Output: 100mW br • Woking Voltage: 3~3.7Vbr • Material: Aluminium alloybr • Powered by: 1 x CR123A 1 x 16340 battery (not included) br • Size: 133 x 31mm 5.2 x 1.2in(L x Dia.