buzzer / horn powered by BEC?

Silly question, but seeing as Flat Damon is just a push bot, I was wandering if I could set up a little horn for him to pap angrily at people (and to check the RC / TX is working without spinning the wheels).

I don't suppose there is something I can just plug into the receiver and power it using the BEC and an on / off signal from the receiver (perhaps the landing gear switch on the dx6i?) ? Does such a thing exist?

Ta,
Steve

Edit: I did Google it first, honest! Found it now - called a discovery buzzer.
https://hobbyking.com/en_us/hobbykin...___store=en_us

For 2 and a half quid I'll give it a go...

I know you can get 5v buzzers. Just use an RC switch to connect one of those to the BEC. https://hobbyking.com/en_us/turnigy-...___store=en_us

Cheers. that could be good too - might mean I could do a louder one or sort out a custom noise.