Well generally, you'd use a bluetooth transmitter. But I think most of those connect to the optical/USB/RCA ports on your TV. I'd imagine your monitor is just going to have HDMI and maybe displayport. Is there a reason you want to get a small monitor vice a small TV? Should be around the same price, and then you can snag up a bluetooth transmitter for around $20-$30 from Amazon or wherever.
Two pretty good brands: Avantree aptX Bluetooth Transmitter / TaoTronics Bluetooth Transmitter