Ceremony music without power?

Hello everyone!
I’m getting married 9/7 and my DJ was supposed to provide music at our ceremony as well as our reception. However, he just notified us yesterday that his ceremony system isn’t portable and requires access to electricity, which there is none at the ceremony sight.
We’re thinking of buying this speaker and trusting a guest/family member to control the music. I’m not sure who to go to, though and I’m a little unsure of the speaker’s sound.
I know it’s last minute, which is why I especially need advice 😬
Has anyone done something similar? Was it simple to do? How did the experience go?

Thanks!