I have the Fender Monterey Bluetooth Speaker it's perfect for outside. It looks like a traditional Fender Amp and sounds great with Volume, Bass, Treble adjustment knobs. It has a toggle on/off switch once you switch it on it connects automatically to your TV and it will automatically shut off if you mute your TV for approx 20 minutes.
I got mine on sale last year for approx 9,000 baht but the nicer version(Monterey Tweed Yellow Mustard, which is usually 18,000 baht) is on Lazada for 10,000 baht. There's also a black barely used version on Lazada for $6,400 baht. The Fender Monterey sells for $400 in the U.S.A.