Plantronics Vista M22 Audio Processor

I work from home. The company I work for has me take customer calls via a VoIP phone. The volume during calls would randomly become so quiet I could not hear the person speaking or so loud that my ears literally would hurt. There would be random loud crackling sounds, high pitched noises, etc during the call, too. My manager had no idea what could be causing it. After several months, I noticed that I was having a harder time hearing those around me, TV, etc. I became worried that my job was making me deaf. I did some research, found that this was compatible with my headset, and bought it hoping it regulate the sounds coming from my headset. IT WORKED WONDERFULLY!! I no longer have to deal with the headset volume randomly becoming exceedingly loud or quiet. The volume remains the same throughout the call and for every call. As an additional benefit, this device also boosts my voice so I no longer have to yell for my callers to be able to hear me. Well, for the most part. There are some callers that are hard of hearing or in a extremely noisy area that I still need to speak louder for them to hear me, but most callers can now hear me fine. I highly recommend this product!!

Good product.

This product works great. It's easy to connect, and easy to use. The volume control is a big help when a caller is faint. You can also adjust the outgoing volume easily. It has one significant flaw--it goes through batteries so quickly that it's not worth using this device unless you use a power adapter with it, which I now do.

So far so good. Our office has ancient landlines. And im deaf as all get out, HA didn't help with phone calls. But this plus headset! Perfect. Plus im able to turn up, down. Thank you. Not retirement age yet, but losing my hearing big time, as a cust serv rep.. thank you 🥳 Comfy, easy to hook up, long enough cord, no background noise.

Plusses...The mute and volume(listening) buttons are right on top. Easy to plug in and use...Really Big Downside is that the speaking volume control is under a panel you have to remove AND adjust the volume with a tool! If you are on a call and want to turn your volume up, you have to almost dismantle the amplifier! Really inconvenient and not at all practical.. Why couldn't they put the volume control on the top or side? Had I known it was such a hassle just to change the speaking volume, I would have probably not bought it

Works great with our Fujitsu phones and the sound is crystal clear.

This item arrived before the estimated 2 weeks... wonderful job! Per Plantronics' description of this M22 on their website, this amplifier works extremely well with select analog phones (never tried the VOIP ones). I am using this with an AT&T CL4940 (until I get my much preferred Panasonic phone delivered this week), combined with the HW261N headset for my telecommuting job. The combo produces a loud and clear voice transmission--both incoming and outgoing--while in 8-hour phone and web conferences. Even the noise-cancelling feature of the microphone works well enough to completely drown out the lawn mower and the occasional barking of the neighbor's dogs! Not a bad product at all. Slight quibble, however, and my reason for a 4 star... this item was advertised by seller as 'new'. However, it arrived with no cover for the side switches. Other than that, I'm happy with the M22 so far! I will definitely buy another one of these in the near future to serve as a backup. Update 7/1/13: The M22 developed a bad humming sound that can be heard from the caller's side. Even when I tried changing the power adapter to batteries only, the same issue persists. The replacement I asked for had the same problem. It is too late to return this and the other amplifier since it has been more than 30 days. By the way, this amplifier was never dropped or anything. It sits on my desk and is used for work only. This frequent humming issue does not justify the high cost of this purchase. 4 stars down to 1 star (0 if possible).

I now know why there is no power adapter offered with this unit. It works fine on battery. However, I've tried 2 different power adapters and the same issue happens with either. When using a power adapter, the unit creates 'static' on the line making it totally useless. So, I returned the unit.

I bought this a year and a half ago. I use it every day at work and am fully satisfied. Incoming and outgoing volume are easy to adjust. Changed the batteries once in the past 20 months.