secondhand ubotie keyboard trouble

[u/worst10bucksivespent]

So I went to an estate sale and bought an ubotie keyboard and mouse, they said it worked. It's a "sweet wireless keyboard" with number pad, no USB port nor power switch. I only know its powered on from the battery light that flashes when I place the battery in. I've scoured the internet for information on how to pair it to my ipad. Tried holding down Fn+C and Fn+1 (for a while) and neither worked. I'm losing hope please help