Vendors of Ear Products

http://www.earinc.com/p1-electronic-covert.php

http://www.phonak-communications.com/en/company/news/news/2012/09/07/phonak-unveils-profilo-nano-the-smallest-100-interference-free-covert-earpiece-in-the-world/

UK

http://www.enhancedlistening.co.uk/

http://www.spystudy.com/items-spy-ear/professional-earphone.html?XTCsid=k1gi3e5h89a6dsghjhl8jgg756

http://www.showcomms.com/buy/wireless-earpiece-kit-for-security-radio

Transmitter with wallet receiver 200Hz~5400Hz

Bluetooth

http://www.matrixaudio.com Bluetooth Speaker

ARGARD M10 Titanium Bluetooth Headset

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• Looks like China company, no corporate site
• http://the-gadgeteer.com/2007/03/20/argard_m10_bluetooth_headset/

Samsung Mini MiniBlue Bluetooth Headset

Motorola Mini H9 Bluetooth Headset

• No longer manufactured
• Less than on ounce
• 1.3 x .9 inches
• Sound good (pcmag.com)
• User reviews complaining about low volume, others say it is great sound level

Aliph Jawbone Bluetooth headset

• pcmag.com editors choice for best sound quality

Two Way Radios

Bluetooth adaptor
http://senabluetooth.com/product/adapters/sr10/