This power adapter is designed to replace the power supply for your WD Western Digital My Book Essentials hard drive. It provides a 12-volt DC output with a current of 2000 mA, ensuring stable and efficient power to your device. The adapter accepts an AC input voltage of 100 to 240 volts, making it compatible with international electrical standards. Its input frequency is 50 to 60 Hz, ensuring optimal performance in various environments. The pulse width modulation used in this adapter allows for an operating efficiency of 85%, contributing to reduced energy consumption. The connector is of type 5.5 x 2.5 mm, compatible with general 5.5 x 2.1 mm connectors, making it easy to integrate with various devices. The adapter's compact dimensions, with a maximum length of 10 cm, an average length of 15 cm, and a minimum length of 4 cm, make it easy to carry and install. The packaged weight is 0.25 kg, ensuring easy handling. This adapter is a reliable solution for maintaining uninterrupted operation of your external hard drive.