pretty cool, small pedal that emulates several key strokes, such as up-and-down arrows, left and right arrows, page up and page down. Connect this to your iPhone, and you can use Apple Music lyrics to have lyrics at your finger or in your ear as you’re singing. I have a USB version of something similar, but this takes the cake!  audio, demo below. 

LEKATO Wireless Page Turner… https://www.amazon.com/dp/B09CP8HLG4?ref=ppx_pop_mob_ap_share