Inside the iPhone 7: Apple's Taptic Engine, explained | AppleInsider
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How to Make Your Apple Watch Vibrate More Prominently
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Amazon.com : Infantino Lil' Nibblers Vibrating Apple Teether -Sensory Exploration and Teething Relief with Soothing Vibrations and Textures, Red Apple : Baby
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Apple file's a Haptic patent related to their Taptic Engine that introduces the use of an "Inductance Sensor" - Patently Apple