Name: Green Laser Pointer Dimension: Φ30mm*135mm Battery: 1"CR123A" Fixed focus, green dot facula, continous output and working time over 8000 hours. Output wavelength: 532nm. Output power: 100-250MW. Working Temperature: 0C-+40C Storage Temperature: -10C-+50C Warm up time: Under 5 minutes Function: Used in many applications and industries including the military, medical and astronomy, indicator, teaching baton. Safety Precautions: A. Remove the batteries when this product is not to bi used for a long period of time. B. Keep this product away from children.