Simplisafe - new competitor - please read

Um, are those things available now?  If you can't buy it now, you should be prepared for it to never be available, or not be as described now.

Yeah there not available now. That's just my point  when they arrived in  UK they forgot about the bell box that EVERY alarm system offers. My 8 year old would tell you thats the first thing needed my point just being SS should have this if EVERY other system does but the main point is the police dispatch my suggestion is it moves to 2 sensor triggers as if your wifi is off then police ain't coming

They do have the external siren, which is rated for outdoor use.  Would that serve?

what happens if you do not purchase a camera when you bought the system and you have the 2 alarm triggers in place and the single burglar enters and exits threw the same window/door? You loose all your stuff! That;s what happens. :-)

Unless you have motion sensors or other interior triggers (technical term is "layered security")