The invention relates to bio water purifier which improves the structure of water molecular and changes the water to weak alkali drinker. The leading yoke has a greater thickness than the trailing yoke, with a ratio of the thickness of the leading yoke to the trailing yoke of at least 1. The fuel injection controller computes a correction amount based on a difference between the actual injection quantity and the command injection quantity. A pull-down device is coupled to the switching device, the pull-down device to discharge the boot node, the pull-down device further comprising a substrate terminal coupled to the input terminal of the switching device. By varying the drive signal to the vibrotactile transducer and activating one or more transducer at specific location on the body using an appropriate choice of signal characteristics andor modulation, different information can be provided to a user in a intuitive, body referenced manner. For example, audio data can be modified to include additional audio content, andor video data can be modified to include additional video content.