Presented as a useful gadget: Krown Phone Flasher. While I hear perfectly fine out of one ear but when I am sleeping or wearing headphones my good ear is covered - so I just bought Krown Phone Flasher (LED) from Amazon for under $25 dollars. Also - does anyone know if this can be hooked up to speakers? It may help gamers see visual clues to sound cues in games?

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https://www.amazon.com/gp/product/B00DOAHD80/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1