[UPGRADE] High-quality 19V@4.74A power supply, the power cord is made of pure copper, while other brands may use aluminum or copper-plated wire. With UL, FCC, CE, ROHS certification to ensure its safety and quality. Support 2.1~2.5mm plug socket. Universal wide voltage of 100V-240V 50/60Hz, specially designed for Douk Audio / Nobsound amplifier or other audio devices for HiFi sound, with good adaptability and can provide enough power.