Some gadgets earn their keep by being useful. This one earns it by being unfindable. The prank cricket noise machine is a thumb-sized circuit board that randomly beeps, chirps, and imitates a cricket every 5 to 45 minutes, at no predictable interval, for months on a single coin battery. You hide it, you walk away, and someone in that room slowly loses an argument with a sound they cannot locate.
Watch the video above to hear every sound it makes, then read on for how the prank works and how to run it responsibly.
How it works
Each unit is about 5 x 2.5 cm, roughly the size of a finger, and runs on a CR2032 battery that is included in the pack. The pack contains three devices, each with adhesive backing for mounting. The trick is the timing: sounds fire at random intervals between about 5 and 45 minutes apart, with multiple sound options including beeps, chirps, and a cricket noise. Randomness is what makes it maddening. A sound every ten minutes on the dot gets identified and hunted down; a sound that might come in four minutes or forty just becomes part of someone’s afternoon.
Battery life is the other half of the design. Because the device sleeps between sounds and a CR2032 sips power, a single unit runs for months. This is a long-game prank, not a one-afternoon gag, and the volume is tuned for quiet rooms: clearly audible in an office or living room, subtle enough that your victim questions their own ears first.
Where people hide them
The adhesive backing opens up the classic spots: under a desk, behind a TV, on the back of a fridge or air conditioner (appliances that already hum and click, which gives the sound camouflage), inside a plant pot, above a ceiling tile, or on the underside of a couch. The rule of a good hide is that the location should explain the sound away. A chirp near a window reads as an actual cricket. A beep near office equipment reads as a dying UPS battery, which is a sound every office worker on Earth will nod at and ignore-investigate for a week.
With three units in the pack, the advanced move is rotation: when one is finally found, the others are still out there, which is the moment the prank achieves its final form.
Why it works so well
There is real psychology under the gag. Short, high-frequency chirps are genuinely hard to locate: human hearing pinpoints sounds using timing and volume differences between the ears, and a half-second beep in a reflective room bounces off walls and arrives smeared from several directions at once. Add the random timing, which denies the victim a pattern to anticipate, and the brain does the rest, because an unexplained intermittent sound is exactly the kind of loose thread people cannot leave alone. The device is simple. The effect is not.
Practical notes: the CR2032 cell is replaceable, so a found-or-retired unit can be reset and reused for the next victim, and the adhesive backing leaves the device retrievable rather than permanent. Switch the unit off when the prank ends. Comedy has a runtime, and months of battery means you, not the battery, decide when it is over.
Prank etiquette, briefly
Keep it to people who will laugh when it is revealed, and always reveal it eventually. Skip anywhere that sounds carry consequences: hospitals, call centres mid-shift, exam rooms, and anywhere a stray beep could be mistaken for a real alarm or medical device. Some workplaces also have policies about this sort of thing, so pick your venue like you would want it picked for you. The prank is the confusion, not actual distress.
Frequently asked questions
How long does the battery last? Months on the included CR2032, because the device sleeps between sounds and only wakes to beep, chirp, or play the cricket noise at random intervals.
How many sounds does it make? Several, including beeps, chirps, and a cricket imitation, with the timing randomized between roughly 5 and 45 minutes so the pattern cannot be predicted.
How many come in a pack? Three devices, each with its own battery and adhesive backing, for under $15 Canadian for the pack at the time of the video.
How loud is it? Loud enough to be clearly heard in a quiet room, which is the point. It is a confusion device, not a siren, and it works best in offices, living rooms, and other calm spaces.
Verdict
For under fifteen dollars, the three-pack cricket prank machine is close to perfect at its one job. The hardware is trivial; the psychology is the product: random timing, plausible sounds, months of battery, and a size that hides anywhere. As a gag gift or a long-game office prank on the right target, it is very hard to beat per dollar.
Check the current price of the prank cricket noise machine 3-pack on Amazon, the same link from the video description.