A must have for clear conversations on your landline as well as your smart phone. I have a Plantronics headset with a quick disconnect cable, so to use them with the M22 Amplifier I bought a coiled quick disconnect cable with an RJ11 connector and also another quick disconnect cable with a 3.5 mm...

I cannot comment on the quality as I was unable to use it. When I did my research I found reviews that made me think I could use this amplifier on my office phone despite not using a headset.

The disconnect portion of the cords are plastic I almost returned it the minute I saw that.

The amplification was needed with my Plantronics Headset. It is perfect for me, as I have some hearing loss that affected my work. I Obtained an AC adapter, which I feel should be included at the price.

Clear Reception; Durable; Easy Controls

These headsets were a great purchase. From the cost to the quality, it has been great!

Crystal Clear and 100% Reliable. I've been using Plantronics headsets since 1966! I wouldn't think of trying a different company's hardware. This is the 4th replacement in 48 years of constant use 40 hours a week, 50 weeks a year.

The heaqdsets work as desired. They were shipped very quickly. Great customer service from B&H.

It worked for about 2 months now it won't work at all

Arrived very quickly. Easy to use and set up.

We have had several of these in the office for years. They have proven to be very dependable and provide good sound quality to both users.