Specificaton:Switch:tail switchPower supply:1 x 16340/CR123A battery(not included)Light distance: 500M-5KM (depending on the power)Voltage:DC=3.0V-5.5VStart Voltage:DC=2.6VCurrent:<200mAhPerfect Working Environment:0℃ - +30℃Storage Temperature:-10℃ - +40℃Output:1-200mwWave Length Range:532nmWave Length:532nmWeight:50gFunction:1. Field travelers / climbers / explorers:For outdoor adventures. ie. Measure distance, sent out distress signals, enable your travel be more happy and safe2.Amateur astronomers:Used for astronomical refers to the star, green laser is very suitable for used in the observation of stars at night, can accurately indicate the position of the stars.3. Mining field / construction personnel:Used for long-distance accurate instructions/buildings. Avoid danger zone4. Teaching and tour guide:It is an excellent tool for teaching. Ie. Make a PPT presentation, tourist attraction explanation.Package Includes:1 x 5mW 532nm Green Laser Pointer Flashlight Style1 x Star Capter