The PowerTouch Learning System was far more advanced than the LeapPad in many ways, requiring no stylus to operate as it uses a touch-sensitive area, and even the ability to detect page changes automatically via a set of infrared sensors on the top of the device(which also imposed a limitation on how many pages a book for the system can offer). The popularity of the LeapPad spawned a few competitions, most notably with Mattel and Fisher-Price who launched the PowerTouch Learning System in 2003, and later with the Power Touch Baby. The sensor works as a capacitor and measures the amount of current flowing through corner electrodes into a plate beneath the table top, and uses that information to triangulate the location of the stylus on the table top.
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The LeapPad is a computer with electrographic sensor. The unit also featured a soft pad underneath to allow for the device to sit comfortably on the parents' or toddler's lap.
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The LeapPad's popularity helped spawn other LeapPad branded devices that are incompatible with the mainstream LeapPad series of players. Spin-offs incompatible with the mainstream series
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LeapPad Plus Microphone (also known as Read Aloud LeapPad).
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Various models of the LeapPad were developed between its launch in 19: