The Trainer offers these words on a suggested throat mic for radios that he's tested in the field and found excellent.
Here's the throat mic company: http://www.dynamicdesignsus.com/servlet/the-95/Throat-Mic-Tactical-Headset/Detail
The model in this pic is the serious one. $40, but worth it. After you check out their site, you'll find they have all sorts of goodies including replacement parts, cheap. They ship fast and stand behind what they sell.
And here is the description from the site:
Throat Mic Tactical Headset for Midland (2 Prong Plug)
Manufacturer: Dynamic Designs
The new tactical / heavy duty adjustable throat microphone with acoustic tube (FBI style) headset as seen in the actual photos. The dual condenser microphone picks up the user's voice directly from the vocal chords. This drastically cuts down on ambient noise. The clear acoustic tube headset fits snugly in the ear and keeps incoming transmissions clear and private. Excellent for use in loud environments. Features a large heavy duty push to talk button that is easily accessible while wearing heavy gloves and can be clipped almost anywhere. Can also be mounted on your side with the PTT button activated by an elbow without taking your finger off the trigger. Replaces costly original manufacturer's headsets- perfect for tactical and service applications in loud environments. Can be used on either the left or right ear.
Excellent for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments.
Headset is for use for all Midland Extra-Talk and G-Series radios and many more requiring a 2 prong Midland plug:
* G Series: G223 G-223, G-225 G225 G-225C2, G226 G-226, G227 G-227, G-227C2 G227C2, G300 G-300 G-300C2 G300C2, G300M G-300M, G300MC2 G-300MC2
* GXT Series: GXT GXT-250, GXT300 GXT-300 GXT300VP3 GXT-300VP3, GXT310 GXT-310 GXT310VP GXT-310VP, GXT325 GXT-325, GXT400 GXT-400, GXT444 GXT-444, GXT450 GXT-450 GXT450VP4 GXT-450VP4, GXT500 GXT-500 GXT500VP4 GXT-500VP4, GXT550 GXT-550 GXT550VP4 GXT-550VP4, GXT555 GXT 555, GXT565 GXT 565, GXT600 GXT-600, GXT635 GXT-635, GXT650 GXT-650, GXT661 GXT-661, GXT700 GXT-700, GXT710 GXT-710 GXT710VP1 GXT-710VP1 GXT710VP3 GXT-710VP3, GXT720 GXT-720 GXT720VP3 GXT-720VP3, GXT735 GXT-735, GXT750 GXT-750 GXT750VP3 GXT-750VP3, GXT 775 GXT-775 GXT775VP3 GXT-775VP3, GXT800 GXT-800 GXT800VP4 GXT-800VP4, GXT808 GXT-808, GXT850 GXT-850 GXT850VP4 GXT-850VP4, GXT900 GXT-900 GXT900VP4 GXT-900VP4, GXT910 GXT-910 GXT910VP3 GXT-910VP3, GXT950 GXT-950 GXT950VP4 GXT-950VP4
* LXT Series: LXT, LXT80 LXT-80, LXT110 LXT-110 LXT110VP LXT-110VP, LXT210 LXT-210 LXT210VP LXT-210VP, LXT216 LXT-216, LXT300 LXT-300 LXT300VP3 LXT-300VP3, LXT303 LXT-303, LXT305 LXT-305, LXT310 LXT-310, LXT315 LXT-315 LXT315VP3 LXT-315VP3, LXT317 LXT-317, LXT320 LXT-320 LXT320VP3 LXT-320VP3, LXT322 LXT-322, LXT330 LXT-330 LXT330VP3 LXT-330VP3, LXT335 LXT-335 LXT335VP3 LXT335-VP3, LXT340 LXT-340 LXT340VP3 LXT-340VP3, LXT345 LXT 345 LXT345VP3 LXT-345VP3, LXT350 LXT-350 LXT350VP LXT-350VP, LXT410 LXT-410, LXT420 LXT-420, LXT435 LXT-435, LXT440 LXT-440 LXT440VP3 LXT-440VP3, LXT460 LXT-460 LXT460VP3 LXT-460VP3
The coiled cable length from the radio connector to the push to talk button is 6 feet (fully extended). The coiled cable length from the button to the throat microphone is 5 feet (fully extended). Push to talk button is 1.75" wide. Throat mic has been tested on neck sizes up to 19".
Speaker Specs: DIM: φ45±0.5mm Impedance: 8Ω ±15% Sensitivity: 82dB±3dB Frequency Response: 200Hz-3.5KHz
Microphone Specs: Size 9.7 X 6.7mm Frequency Response: 20Hz-16KHz Impedance: 2.2KΩ Sensitivity: -36dB±2dB
Color: Clear silicone ear piece with clear coiled cable with black microphone, cable, button and connector.