A DC5521 power jack is a DC connector that securely links external adapters to electronic devices, enabling stable voltage transmission for applications like guitar, LED lights, CCTV cameras, and optical modems. | Unique Bargains | | 30pcs DC5521 5.5x2.1mm 30V 0.5A 3Pin Female Jack with Dust Plug for Guitar/Car Audio/Power Supply | Black, Red, White | Black/Red/White | Best Buy