What’s the use case?

are you looking for an installed house alarm or one of those portable doorbell sized sensors with a piezo?

Your post lacks info, please take some time and provide more context, so people can actually answer your question accurately.

Doberman

k1w1k1d:

Doberman

Stu:

k1w1k1d:

 

Doberman

 

Long term running costs tend to be a little high for many.

Depends on how fast they run.... and if they can make the fence in time.

i am told if you have something that makes a loud noise if someone breaks in, it might scare them away.

not sure if that's worth it though.

i thought cameras more useful.

Batman:

 

i am told if you have something that makes a loud noise if someone breaks in, it might scare them away.

 

not sure if that's worth it though.

 

i thought cameras more useful.

 

Yep - a metal bucket full of metal bits and pieces or old cutlery, balanced on top of a half-open door. Ticks all your boxes - noisy AF and cheap, even without a Black Friday price.

You could try the camera approach and fill the bucket with old cameras - but old cutlery is easier and will make more noise.

Stu:

k1w1k1d:

Doberman

Long term running costs tend to be a little high for many.

eracode:

Batman:

i am told if you have something that makes a loud noise if someone breaks in, it might scare them away.

not sure if that's worth it though.

i thought cameras more useful.

Yep - a metal bucket full of metal bits and pieces or old cutlery, balanced on top of a half-open door. Ticks all your boxes - noisy AF and cheap, even without a Black Friday price.