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The Mobile Sensor Pen operates at a frequency range of 800Mhz-1800z and will start flashing if you have an incoming call on your cell phone. According to the web site, you can avoid becoming a "social pariah" by setting your phone to 'silent ring' in public areas and use this pen to alert you of incoming calls. Effective distance is 2 meters, and the included AG3 mercury batteries give this pen a run time of about 300 hours. The Mobile Sensor Pen will also alert when wireless cameras are nearby, which is a nice bonus. Sadly, no information is available about if it actually writes as a pen, but we assume it does, right?
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