??Today， we would like to recommend you this 303 1mW 532nm Green Laser Pointer Pen with Key Lock to you. Made of top quality aluminium alloy， it is durable for long-term use. It is easy to operate. Only need to push the button， and then you can see bright light shoot forth. Besides， the light can point at any targets， such as photos， blackboard， video monitors and so on. Except that， it is perfect for teachers， professors， doctors， managers， engineers and so on. Take one for your daily use!                                    Features             Made of high quality aluminium alloy， it is durable enough for long time using<br> It can offer a wide and clean view from the far<br> Perfect for teachers， professors， doctors， managers， engineers and so on <br> Power-saving， compact and reliable<br> Simply press the button to activate the laser pointer and release it to deactivate<br> Great for teaching， meeting， speech， training， remote indication， mountaineering expeditions and other outdoor activities<br> Include a key lock， convenient to use   <br>                                                            Specifications             Key Words     Green Laser Beam    <br> Light Color     Green    <br> Body Color     Black    <br> Material     Aluminium    <br> Wave Length     532nm    <br> Output Power     1mw    <br> Battery Configuration     1 x 18650 Battery (Not Included)    <br> Switch Location     Side    <br> Strap/Clip     No    <br> Dimensions     (6.30 x 0.91)" / (16 x 2.3)cm (L x Dia.)    <br> Weight     3.84oz / 109g     <br>                                                             Package Includes            1 x Laser Pointer Pen<br>1 x Key Lock<br>                                                            Extra Info            Note: Don′t allow the laser beam to enter the eye. The laser beam is harmful to eyes， any contact will cause permanent damage. Not the laser point to the crowd， especially in the face.Don′t look directly with your eyes or using binoculars and other equipment to observe the laser beam on the remote control. Never let the laser point to a mirror or other highly reflective surfaces.Please keep the laser pointer away from children (especially the high powered ones) in order to avoid the damage by the children′s contacting.Please don′t light laser pointer continually in 30 seconds and press the button hard， it will affect its lifetime for prolonged use.Please remove the battery from the laser pointer when not in use.Need to disassemble， adjust or repair， please get professional maintenance technicians.The use of laser pointers (especially the higher powered ones) may be illegal in some countries. Therefore， customers can buy and use it by following the local laws and regulations. In the event of resale， you also need to incorporate this notation in the product description， so that any potential buyer can be well informed before making purchasing decision.