Cell Phone Detector Pen, retail $2.00
Manufactured by (Unknown)
Last updated 07-25-12

The Cell Phone Detector Pen is a ballpoint pen in a metal body, and has a red LED in the top of the pen that flashes whenever a nearby cellular telephone rings - even if you have the ringer turned off.

The ballpoint pen writes with black ink, and works whether the batteries are good or not.


To use the pen portion of this gadget, grasp the unit so one hand is on the pocket clip on the barrel, grab the unit near the pen tip with the other, turn the business end of the barrel clockwise (as if tightening it), and the pen tip should extend so you can write with it. Turn the business end of the barrel counterclockwise (as if loosening it) to retract the pen tip.

Whenever your cellular telephone rings, a red LED in the upper part of the pen flashes to let you know the phone is ringing, even if you have the ringer muted.

The receiver in this product is sensitive to a frequency range of 800MHz to 2,400MHz (2.4GHz). This frequency range should encompass the majority of cellular telephones in service today.

The distance range is from 1m to 2m (39" to 78").

To change the batteries, hold the pen so the point (the ink portion) is facing upward, and unscrew the two halves. Throw the lower portion in the dustbin (garbage can) - O WAIT YOU'LL NEED THAT!!! So just set it aside instead.

Tip the open end of the pen upside down over your hand so that the two cells come out. Dispose of or recycle the batteries as you see fit.

Hold the barrel of the pen horizontally in one hand, and slip two new AG3 button cells in with the other hand. Insert the cells button-end (-) first. Screw the two pieces back together.
Aren't you glad you didn't throw out that lower portion now?

The pen portion writes in black ink, and appears to write in a quality you might expect from any medium quality to good quality disposable pen.

There are no environmental seals (O-rings) visible on it, so is not water-resistant. Therefore, water, milk, diet vanilla Pepsi, cold (or hot) coffee, urine, ice cold fizzy root beer, or other liquids could get inside. So please try not to drop it in creeks, rivers, ponds, lakes, oceansides, docksides, snowbanks, puddles of Holsein cow pee, tall cold glasses (or short lukewarm glasses) of milk, slush piles, mud puddles, tubs, root beer floats, toilet bowls, cisterns, sinks, cups of coffee (hot *OR* cold), fishtanks, dog water dishes, old yucky wet mops, wall-mounted porcelain uranators, leaky water heaters, busted garden hoses, puddles of antifreeze, brake fluid, tranny fluid, gasoline, or other places where water or water-like liquids might be found. And you'll probably want to cover it up or otherwise get rid of it (such as by putting it in a pocket or bag) if you need to carry it in rainy or snowy weather.

If it fell in water and you suspect it got flooded, disassemble it as you would for a battery change, dump out the water if necessary, and set the parts in a warm dry place for a day or so just to be sure it's completely dry inside before you reassemble and use it again.

If it fell into seawater, got thrown into a glass of milk, if it fell in a root beer float, if somebody squirted a Massengill brand post-menstrual disposable douche or a Fleet brand disposable enema at it (and hit it with the douche or the enema), or if somebody or something got "pist" off at it and subsequently "pyst" on it, rinse all the parts out with fresh water before setting them out to dry. You don't want your pen to smell like seaweed, sour milk, flowers, fresh butts, or rotten piss when you go to use it next. Besides, salt (from seawater, disposable douches, disposable enemas, or uranation), lactic acid (from moo juice), or sugar (from root beer & ice cream) can't be very good for the insides.

The cellular phone detection device is what makes this product worthwhile; it is handier than you might think. If you muted the ringer on your telephone and then forgot about it, the flashing red LED on the end of this pen will tell you when you have an incoming subspace signal...er...uh...an incoming call.

Spectrographic analysis
Spectrographic analysis of the red LED in the end of this pen.

USB2000 spectrometer graciously donated by P.L.

This video shows the Cell Phone Detector Pen reacting when a nearby cellular telephone rings -- the ringer was muted on the telephone though you can see the display engage so you can tell it's ringing here.

This video clip is approximately 1.7 megabytes (1,936,916 bytes) in length; dial-up users please be aware.
It will take no less than five minutes to load at 48.0Kbps.
I cannot provide it in other formats, so please do not ask.

The TV program "Mythbusters" was on when this was recorded; this product
isn't sound-sensitive, so the sound may be ignored or muted if desired.

Test unit was sent by a website fan and was received on 06-04-05.
It did not function when I received it, but I found it while looking for my Wag-A-Flag on the morning of 07-04-07 (not found) and tried it again - this time it *DID* function. Probably because I changed brands of cellular telephone in (I believe) December 2005.

Product was made in China.
A product's country of origin really does matter to some people, which is why I published it on this web page.

UPDATE: 00-00-00



    PRODUCT TYPE: Pen/cellular telephone ring detector combo
    LAMP TYPE: 5mm red LED
    No. OF LAMPS: 1
    BEZEL: Metal; LED protected by transparent plastic cylinder
    BATTERY: 2xAG3 button cells
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER- AND PEE-RESISTANT: Light splatter-resistance at maximum
    ACCESSORIES: 2xAG3 button cells
    WARRANTY: Unknown/not stated


    Star Rating

Cell Phone Detector Pen *

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