Features: . 1. It is used to point at any desired target on projection screen, video, etc. 2. It can be used for presentation, teaching indicator, etc. 3. With star cap it can show variable wonderful patterns at night. 4. When take off the cap, it is a single beam pointer pen. 5. Across the sky, leading you to find the stars in the clear nights. 6. Lightweight, suitable for putting in your pocket or handbags, easy and convenient to bring. 7. This high quality laser pointer adopts the latest technology optics and microelectronics. 8. Designed with green color light, which is easier for you to find the target and highlight the key point. 9. Made of aluminum alloy, more durable, handle is made of anti-slip material, which prevents the laser pointer pen from dropping down. 10. Designed with a hang rope, convenient to bring and you don't need to worry about losing it. 11. Designed with a waterproof sealed ring at the end, which keeps water from running into it. 12. Power-saving: with a key to lock the laser to avoid power loss -- when the key points at the red point ~ lock (green point ~ unlock). Kindly Remind: 1. After putting the correct battery, please use the key to unlock the laser firstly and then press the button. 2. The laser pointer pen was influenced by temperature. In winter, if temperature is low outside of room, please warm up the laser pen for 5 minutes. 3. Avoid direct eye exposure to laser beam. 4. Please don't keep open for a long time, otherwise easy to damage the light bulb. 5. Children should only handle lasers under adult supervision. 6. The laser is high power. So it runs out of battery quickly. And please don't keep the laser on continuously for more than 2 minutes or it will get burnt from inside easily. Note: In order to pass the security check, we mention the power is less than 5mW on the laser pen label. The laser pen real power is over 5mW. Great thanks for understanding. Specifications: Item Type: Laser Pen Model: 303 Body material: Aluminum Alloy Laser Color: Red/Purple (Optional) Housing Color: Black (Optional) Size: (Dia x L) 2.3 x 16cm / 0.9 x 6.30in (Approx.) Power supply: 1 x 18650 Battery (Not included) Beam style: continuous line Spot size: 6M Lifespan: 8000 hours Working voltage: DC=3.0-3.7V Preheat time: < 3 seconds Working temperature: +15C to +35C Storage temperature: -10C to +40C Output power: 5mW Quantity: 1 Set (other accessories demo in the picture is not included) Note: 1. Transition: 1cm = 10mm = 0.39inch 2. Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before you purchase. 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Laser Pointer Pen 2 x Keys