The Plantronics T10 replaces a 20-year old Radio Shack equivalent they OEM'ed from AT&T. That older unit served me very well, but the padding on the earphone was disintegrating, and I could not get replacements; and all the switches were filled with static and behaving erratically. I selected this Plantronics as the next step up. Plantronics sells all the accessories and replacement parts so I do not fear that I'll not be able to get replacement parts.
This unit is exceptional quality - sturdy and well engineered. The cable connecting the headset to the body is a small wire-gauge encased in a heavy insulation so it does not tangle or twist upon itself. The buttons are soft, and comfortable, but lack positive tactile feedback. However, since you can hear what you press, this is a minor issue. The volume, and tone dials on the right side are clearly labeled and do precisely what they they say with no scratch or static heard through the headset. Amazingly, the tone dial really does control the tone heard over the headset. The left side controls have switches you normally set once and leave them: the duration of the flash, pulse/tone dialing, and High/Low ringer volume. I like being able to completely turn off the ringer, as the old AT&T could do, but the T10 can only turn down the volume. Also, the AT&T was designed to attach to your belt or conveniently carry around as a sort of pseudo hands-free. The T10, consists of a more substantial base so carrying this around to talk peripateticaly will take some doing.
All in all, I'm very pleased with the quality, and smooth operation of the unit. I like being able to buy accessories as I need them, and having a unit that works exactly as it's supposed to do. I've recommended this unit to my friends over the AT&T.
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