Name:Green Laser Pointer Dimension:φ20*26mm Battery:1pc"CR123A"with recharge. Fixed focus,green dot facula,continuous output and working time over 8000 hours. Output Wavelength:532nm Output power:100-250MW.(100MW,150MW,200MW,250MW). Working Temperature:0°C??40°C Storage Temperature:-10°C??50°C 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.