Lightweight and handy design, the pointer pen is very convenient to carry. Durable pointer pen helps you point to the target easily. Made of high quality aluminum material, it is anti-rust and durable. The length of the pointer pen is 13.8cm, width is 1.1cm. It is perfect for teachers, students, engineers, managers, etc. Item Name: Pointer Pen Material:Aluminum Batteries: AAA Batteries (Not included) Output Power: < 5mW Wavelength: 650nm Size Details: Dimension: 1.1cm x 13.8cm/0.43" x 5.43" (Approx.) Notes: 1. It is recommended to bound it to 30 seconds or less per use to avoid heat buildup. 2. Avoid direct eye exposure to light beam (includes your pets). 3. Please keep the pointer pen out of the reach of children. 4. Remove the batteries when the pointer pen is not in use. 5. If you find that the brightness of the laser beam is seriously reduced, please replace the battery. Package Includes: 1 X Red Pointer Pen(The Batteries are not included.)