Welcome to our store! Non-slip Handle: The specially designed non-slip handle is comfortable and easy to hold with one hand. 2.5mm Universal Connector: With a standard 2.5mm universal connector, our red light pen supports FC interface, SC interface, ST interface. Dustproof Design: The laser head is protected by an open protective cover to prevent the laser head from being damaged by dust. Integrated Chip: The red light pen uses a powerful light source integrated chip, which integrates power management, signal modulation, and switching control. Replaceable Ceramic Core: You can replace the ceramic core according to your own needs, which is more convenient to use. Item Type: VFL Red Light Pen Material: Aluminum Alloy Output Wavelength: 650nm±10nm Battery: 2 x AA battery (shipped without battery) 1 x VFL Red Light Pen 1 x Lanyard 1 x Storage Bag 1 x User Manual Satisfaction Guarantee: Customers are our top priority. If you find any problem with the product, please contact the seller immediately. We strive to provide satisfactory customer service.