Average Reviews:
(More customer reviews)Let me first say that before you buy one of these amps - try adapter cords from the plantronics quick disconnect to plugs first. Chances are you DONT need an amplifier - and this one is no fun. I managed to get my desk voice tube amp (M10 or M12 if I recall) to plug into my cellphone with just an adapter cord - MY speach volume was down a bit but nobody complained, and I used the cell phone's volume to increase the earpiece.
A well designed 2.5 mm amplifier is a great idea. It sure beats a half dozen adapters to hook up a bigger amplifier and expand/reduce the plug size. However the drawbacks outweigh the product design because new phones like the android based phones and the iphone are using 3.5mm 4 terminal plugs for their headsets, which don't work without kludgy adapters on this amp.
Also consider that the amp is powered by a Zinc/Air battery. They start dying the moment they are exposed to air (you pull off a tape seal over an air hole) - regardless if you use them or not. Zinc Air is NOT a problem for a hearing aid, which definitely is going to get its value out of the battery before it dies, but the amplifier should have used a good old standard lithium cell to run it.
As mentioned by others plantronics uses a cut in/ turn off design to save battery power (I have an amp on my desk phone and I can hear when it cuts out during quiet passages. This can create problems that are a royal pain. No signal for a few seconds and you lost your amp. That's not just annoying - its a bad design. A simple on/off switch would have done fine but people would need to remember to shut it off when not in use.
Better idea - go buy a real 3.5 mm amp and cut the 2.5 mm plugs off, solder the wires, and make a real amp work, preferably one not made by plantronics. This one won't work with modern smartphones which are the present workforce on the market with 44 android designs alone.
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