Specification - Product Name: DC Power Connector Adapter;5.5mm x 2.5mm Male Plug to 5.5mm x 2.1mm Female Jack Coupler Converter Application - Suitable for laptop, Android tablet, CCTV surveillance camera, MP3, MP4, led light, Router, Mini Fan, Cable Modem, Hub, photo player, SCM development, electronic dog, access control attendance, car charger. Etc Easy to use - Connect solar equipment, lamps, surveillance cameras, laptops and other devices to provide power for these devices Advantage - conversion and connection of different types of connectors; quick connection and disconnection Feature - Great item for small electronics projects and CCTV applications.,Perfect for making a cable to a desired length or replacing a broken connector.