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A Bluetooth page turner? Talk about a niche device for a niche market.
Unless you have a disability that makes holding an ereader in your hands impossible, normal reading distance (~35cm for young adults and dropping as presbyopia sets in) limits the need for any page turning device.
I will mention that I have three acquaintances who are unable to hold an ereader with their hands but for them, holding a Bluetooth clicker is not possible. Two of them are using a mouth switch to trigger a device that taps the screen to turn a page, the other one is using a device cobbled together by a techie group to achieve similar results by using a pneumatic switch where they blow to page forward or tap and hold and suck to achieve a page back.
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