HP 579799-001 is a 120 W external power adapter listed for the HP TouchSmart 600-1040Es, where it provides a replacement power source for that system.
It accepts 100–240 V AC input. The EET listing identifies a C6 AC port and black casing; EMPR specifies a 7.4 mm connector. These details can help check a match when comparing the adapter with the system and its existing connection.
Associated OEM references are 730982-001, 699935-001, 730982-002 and 849651-001, which can help identify the part in catalogues and service listings.