Description: Fits for converting the 4.0x1.7mm port power into 5.5x2.1mm port power. The adapter features stable and long-time operation, plastic material. Store the adapter into your backpack without spending much space, convenient to carry. Extensive Compatibility - Supporting a versatility of devices with 5.5x2.1mm plug socket. User-Friendly Interface - Allows the operator to complete the insertion operation without any hassle and effort and expertise. Specification: Material: plastic. Size: 39x12mm. Color: show as pictures. Connector: 4.0x1.7mm Male to 5.5x2.1mm Female.