The HP USB-C to 4.5 x 3.0 mm conversion cable is a genuine HP accessory designed to convert USB-C Power Delivery output to the proprietary 4.5 mm x 3.0 mm DC barrel connector used by many HP laptops. It is suitable for use with USB-C chargers or power banks that support Power Delivery and allows compatible HP laptop models, including the Spectre, Envy, Pavilion, and EliteBook series, to be charged.

The cable supports up to 100 W of power and common PD profiles, including 5 V 3 A, 9 V 3 A, 15 V 3 A, and 20 V 5 A. It also features built-in protection against overcurrent, overvoltage, short circuits, and overheating, as well as HP Smart Pin compatibility logic. The cable is approximately 0.9 m long, black, and made with a PVC outer jacket and copper conductors. It is a travel-friendly, portable power conversion accessory for users who want to power HP laptops using modern USB-C PD chargers.