You’re on the wrong website as you can nearly get 3 items for 430usd on the manufacturer’s alibaba page
https://cn1548331678lesw.en.alibaba.com/product/1600480488010-913171371/bluemind_waterproof_remote_control.html?spm=a2700.shop_index.94.2.28431c93OBhtSA
But even at 160usd, what is the point buying it if it doesn’t work as promised … ??
You’d better ask to the designer on the original thread