What's the difference between this product, the ac511m, and the ac511 (without the m)?

The ac511m has a plastic mount that attaches to the stand. Newer Dell monitors do not have the slots in the monitor for it to mount to. Otherwise it is same soundbar as the ac511.

how long is the USB cable?

Mine (purchased December 2021) is at least 3 feet long. Has an attached velcro cable tie.

Can this be used on a dell s2721dgf?

This soundbar is not compatible with the Dell S2721DGF monitor.

Will this work with dell u2312hm monitor?

Here are the monitors from Dell that it will work; E1914H, E1914He, E1916H, E1916He, E1916HL, E1916HM, E1916HV, E2014H, E2014T, E2015HV, E2016, E2016H, E2016HV, E2214H, E2214Hv, E2215HV, E2216H , E2216HV, E2218HN, E2219HN, E2314H, E2316H, E2316Hr, E2318H, E2318HN, E2318HR, E2318HX, E2414H, E2414Hr, E2414Hx, E2417H, E2418HN, E2715H, P1914S, P1917S, P1917SWh, P2014H P2016, P2017H, P2018H, P2214H, P2217, P2217H, P2217Wh, P2219H (with mount), P2219HC (with mount), P2314H, P2317H, P2317HWh, P2319H (with mount), P2414H, P2415Q, P2416D, P2417H, P2418D, P2418HT, P2418HZ, P2418HZm, P2419H (with mount) P2419HC (with mount), P2714H, P2714T, P2715Q, P2717H, P2719H (with mount), P2719HC (with mount), S2719HS (with mount), U2414H, U2415, U2417HJ, U2419H (with mount), U2419HC (with mount), U2515H, U2713H, U2715H, U2719D (with mount), U2719DC (with mount), U2917W, U3219Q (with mount), UP2516D, UP2716D, UP2718Q, UP3017, UP3216Q, UZ2215H

Is Electric	Yes
Power Source	Corded Electric
Speaker Maximum Output Power	5 Watts
Connectivity Protocol	Bluetooth
Wireless Technology	Bluetooth
Connectivity Technology	USB
Audio Driver Size	50 Meters
Item Weight	0.97 Pounds
Item Dimensions D x W x H	2.38"D x 17.44"W x 1.38"H
Unit Count	1.0 Count
Frequency Response	1000 GHz
Compatible Devices	Dell E1914H, E1914He, E1916H, E1916He, E1916HL, E1916HM, E1916HV, E2014H, E2014T, E2015HV, E2016, E2016H, E2016HV, E2214H, E2214HV, E2215HV, E2216h, E2216HV, E2218HN, E2219HN, E2314H, E2316H, E2316Hr, E2318H, E2318HN, E2318HR, E2318HX, E2414H, E2414Hr, E2414HX, E2417H, E2418HN, E2715H, P1914S, P1917S, P1917SWh, P2014H, P2016, P2017H, P2018H, P2214H, P2217, P2217H, P2217Wh, P2219H (with mount), P2219HC (with mount), P2314H, P2317H, P2317HWh, P2319H (with mount), P2414H, P2415Q, P2416D, P2417H, P2418D, P2418HT, P2418HZ, P2418HZM, P2419H (with mount), P2419HC (with mount), P2714H, P2714T, P2715Q, P2717H, P2719H (with mount), P2719HC (with mount), S2719HS (with mount). Dell UltraSharp U2414H, U2415, U2417HJ, U2419H (with mount), U2419HC (with mount), U2515H, U2713H, U2715H, U2719D (with mount), U2719DC (with mount), U2917W, U3219Q (with mount), UP2516D, UP2716D, UP2718Q, UP3017, UP3216Q, UZ2215H
Speaker Size	1.38 Inches
Water Resistance Level	Not Water Resistant
Bluetooth Range	10 Meters
Number of Microphones	2
MP3 player	No
Specific Uses For Product	Multimedia
Controller Type	Voice control
Color	Black
Is Waterproof	FALSE
Warranty Type	Limited
Maximum Range	20 Meters
Control Method	Voice
Audio Output Mode	Stereo
Mounting Type	Bar Mount
Speaker Type	Soundbar
Additional Features	Bass Boost
Recommended Uses For Product	For Computers

DellPro Stereo Soundbar

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