1、Non Slip Handle: The specially designed non slip handle is comfortable and easy to take with one hand. 2、2.5mm Universal Connector: Using standard 2.5mm universal connector, our red light pen supports FC interface, SC interface, ST interface. 3、Dust Proof Design: The laser head is protected by an open top protective cover to prevent the laser head from being damaged by dust. 4、Integrated Chip: The red light pen adopts a powerful light source integrated chip, which integrates power management, signal modulation and switch control. 5、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 Instruction Manual