The ThinkGeek Annoy-a-tron 2.0

Now that they've mostly recovered from the twisted mind maze that was the original Annoy-a-tron, send them on a new journey of "self discovery" with version 2.0 Now featuring 6 sound choices plus volume control, it's at least twice as fun (and annoying) as the original. For effective deployment, we humbly suggest the following sound and volume combinations, but you can conduct your own field research for more insight.

• 15kHz (Teen Buzz tone** - young folks can hear it, older folks cannot!) (full volume)
• Cricket chirping (medium/low volume)
• IM Doorbell (low volume)
• Grating Electronic noise (full volume)
• Typical Electronic Beep (medium volume)

The cricket chirping sound is interesting because someone will instinctively look near the ground when trying to locate a cricket. So, placing the Annoy-a-tron several feet or more above the ground will help to obscure its location. The 15kHz sound is also interesting because this frequency range of sound cannot be heard by everyone. In older adults or those with deteriorated hearing (a condition known as presbycusis) this high frequency sound will not be audible, while others will clearly hear the sound and find it quite annoying. They also might think they are going crazy because people nearby will report that they don't hear anything.
Assuming you have done your part in selecting a suitable hiding location for the Annoy-a-tron, it will do its part to drive your co-workers slowly mad with its short and seemingly random beeps. And when someone does locate the Annoy-a-tron, they're not going to know what it is - which is almost as much fun as watching them search for it. Muahaha...
The Annoy-a-tron 2.0 takes one CR2450 battery (included) and measures approximately: 2.5" x 1.5" x .35". It will run for over 4 weeks on a single battery.
** - The 'Teen Buzz Tone' is a frequency that young people can hear but older folks cannot. Sometimes younger folks cannot hear it and sometimes older folks can hear it, but, in general, it's called the 'Teen Buzz' tone. When you can hear it, trust us, it's annoying. Dogs agree.

• Six sounds choices: beep, 12 kHz electronic noise sound, 15kHz, cricket, doorbell, alternating between all sounds
• Volume knob
• Two magnets for great hiding ability