help with RF relay project

I am trying to make a AC power remtoe controled relay DC power i need help i have taken it apart and determined it converts it to 5 volts DC and the relay needs 15 volts i have already desoldered the relay and plan on using a lower voltage relay it uses a decoder ic part numT2272-L4 please help.

product: https://www.jascoproducts.com/products/pc/viewPrd.asp?idcategory=48&idproduct=403

pdf for IC: https://www.spelektroniikka.fi/kuvat/PT2272.pdf

i can not understand you

A relay with a lower voltage will probably need a higher current. The IC might not be strong enough to drive a relay that uses a higher current.