USE NOTE:1. The use of the laser beam is absolutely does not allow the irradiation of the eye in front of humans and animals2. Remove the batteries when not in use, put the child is not easy to get a place3. If you find that the brightness of the laser beam is seriously reduced Please note that to charge the battery.Specification:color:GreenWavelength: Green: 532nm,Output power: <1MWBeam style:continuous line.Preheat time: < 3 seconds.Working temperature: +1535.Storage temperature: -10+40.Dimensions: 16.5 x 2.2cm(as photo)Switch: touch switchOperating Voltage: DC 3.7V.Battery: Built-in 1800mAh lithium battery Laser Pointer Pen Features:It is used to point at any desired target on projection screen, video, etc.It can be used for presentation, teaching indicator, etc.Across the sky, leading you to find the stars in the clear nights.Lightweight, suitable for putting in your pocket or handbags, easy and convenient to bring.This high quality laser pointer adopts the latest technology optics and microelectronics.Press-button switch at the middle, need to keep holding when use it.Made of aerometal, more durable.Designed with a hang rope, convenient to bring and you don't need to worry about lossing it.The copper at the end is fixed by aluminium sheet, which avoids short-ciruit.The handle is made of anti-slip material, which prevents the laser pointer pen from dropping down.Designed with a waterproof sealed ring at the end, which keeps water from running into it.Package1 x PEN LASER1 x Star cap1 x USB Charging Cable