Features: This power source is specially for A1706 A1707 A1989 A1990 A2141 A2159 A2251 A2289 A2338 models to ensure full compatibility with your equipment without worrying about damage to the equipment. The product adopts 821-01646-A charging interfaces, which can provide stable power supply to ensure the normal operation of your equipment. Our products have strict quality testing, which can ensure the quality and performances of the products, and give users a assured purchase experience. Our user-friendly product design makes the installation process very simple, so that you can quickly get started, eliminating complex installation steps. Perfect for use in home offices, professional repair shops, or educational environment where maintaining device functionality. Specifications: Component:ABS Size:Approx.2x2cm/0.79x0.79inch Package Includes: 1Pc Power Port note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.