This Listing is for (1) ONE Dell Multimedia Soundbar For Ultrasharp Monitors AX501 0C730C All have been tested and working These were all pulled for safety and security @ local prison All have good quality sound All mounting tabs accounted for these are either powered by your ultra sharp monitor or a separate Power Supply AX510 (K512C) --- The AX510 soundbar is for Dell P, and U series displays manufactured before February 2014. These sound bars attach to tabs on the back of the LCD. These tabs are on the back of the display along the bottom. The speakers are powered through an AC power jack on the display. Examples of such displays: 2407FP, G2210, U3011, U2711, U2713H, 3008WFP, etc. The AX510 has two variants of speakers: AX510 (Without Power Adapter): For displays that can be powered directly by a connection to the DC out port on the flat panel monitor. AX510PA (With Power Adapter): For displays that do not have a DC out port, which can be powered with paired AC power adapter connected to a wall outlet. Usually for those flat panels monitor that without DC out port. See other listings for tools and computer / server parts Check Out My Other Listings For Possible Need / Want