Siren drained batteries in a couple weeks?

Hi,

My extra Siren is lost connection, so checked the batteries (has lasted about a year or so) and they needed replacing which I did with 4 fresh AA batteries.  about 2 weeks later, disconnected again and on checking batteries, seems they've been drained again?

Is it an issue with the siren or the batteries I'm using (regular amazon basic AAs)

Thanks