There are lots of others on there that will do the same thing.
You need a bluetooth receiver on your speaker. You may have one built into whatever sound system you're using. If not, you can buy one on Amazon. That same product I linked above can be a receiver (there's a switch on the side).
Check your inputs and outputs, you may need some kind of adapter. If you buy the one above, you'll need a 1/8 to 1/4 headphone adapter. You probably have some of those around the band hall, they often come with headphones.
If you want it to be always-on, you'll also need to connect a charger to the adapter(s).