Check the listing for details. (2) ULTRA-Miniature MICROPHONE - Excellent Frequency Response, less than ¼" dia.. Condition: New. Listed at 8.95 USD. Sensitive Internally Boosted Surveillance 'Bug' Microphones 0129 Most purchases qualify for a ** Combined Shipping Discount ** Fast eMail Fast Shipping Guaranteed Good-on-Arrival (2) ULTRA-Miniature Electret Microphones Internal FET Amplifier for Great Sensitivity Check out how small these are below! Price is for (2) Projects Unlimited, Inc. Microphones WIDE Response: 50 Hz - 30 KHz Super Clarity, LOW Distortion High 58 dB S/N Ratio Omni-Directional Ultra-Miniature 6 mm D, 2.2 mm H High Sensitivity -44 dB (0dB = 1V/Pa) 2.2K Ω Impedance Rated for 2 Volts The frequency response is smooth from 50 Hz to 15 KHz and rolls off only a few dB at 30 KHz. Datasheet: POM-2244P (1097K PDF) --> Part values are not critical. Change the resistor for other voltages. Use 4.7K for 5-6V, etc. Perfect for surveillance work. Nice replacement MIC for just about any electret circuit. Cost effective for all kinds of HAM, experimenter and hobby projects. This listing is for microphones only. The other parts are NOT included. Below is an example of just how small these microphones are. We replaced the original "miniature" microphone of a tiny Transmitter 'BUG'. Compare the sizes of the microphone and the button battery. [Note: Purchase is for microphones only. The 'BUG' is NOT included.] BEFORE AFTER MP-2 800 pixels REVISED Rev11/05/20 added sentence to check our store for other listed quantities --> ************************************* ham radio etronic e-tronic hamtronic qba BootsParts USA boots PAYMENT and SHIPPING ** We offer a Combined Shipping Discount for most purchases (no books) if paid with ONE SINGLE PAYMENT with eBay's SHOPPING CART ** Condition of Goods Unless otherwise noted above: NOS (New Old Stock) or better, clean, unused 30 day Non-DOA, Good-on-Arrival Guarantee Untested, but NO JUNK or suspect parts PCB parts are thru-hole, NO SMD/SMT Small parts may be bulk packed Manufacturers and Date Codes may vary Attention International bidders only: Sorry, we ship to US ZIP Codes ONLY. We DO NOT ship Internationally. We ONLY ship to Registered US addresses. We DO NOT accept INTERNATIONAL payments. IMPORTANT: The parts we sell are categorized as new because they are unused, but many of our parts are those rare, hard-to-find, discontinued, manufacturing surplus and / or old stock commonly known in the parts business as 'NOS' (New Old Stock). Some of our stock pictures show date codes which may vary from the actual product shipped. Parts from a larger OEM package may be repacked for smaller lot size orders or for more practical handling and shipping. See our store for other listed quantities. We strive to give full and accurate descriptions to earn your 5-Star Feedback. Any known deficiencies are listed in the detailed description. Datasheets are provided when available. Some datasheets may be close but not a perfect match because of part revisions or because they may be from a different manufacturer. If you have any questions concerning our products please email us before purchasing. Your complete satisfaction is important to us before and after the sale. Thank you. 110520