I've operated this Kasp alarm in my shed for about 3 months now and I have to say that I am not really impressed.
Firstly, the A4 Sheet 'Owner's Manual' gives very basic deatail, doesn't inform about how to set the alarm, alarm delays on entering & exiting the protected building etc. Might sound a bit basic but it does add to confusion
In operation it is inconsistent. Sometimes when selecting the system on the receiver the alarm sounds continuously - even after a good delay from leaving the shed and you have to switch off and start over. Other times selecting either of the alarm modes (siren or chime) results in just silence. So you don't know whether it is armed or not. When entering the alarmed building sometimes the alarm sounds immediately and sometimes there is a delay - inconsistency doesn't breed confidence!
The siren is weak - there isn't enough volume to wake me up and even my wife who is a very light sleeper wasn't roused when I 'tested' her. We do have to have the receiver in the kitchen as the signal won't penetrate our 3ft thick stone walls, so it may work if you have it by the bedside.
It uses mountains of batteries and the first lot in the receiver have just gone down - after 3 months!
On the plus side; I always take the receiver with me when I go to the shed and it has never failed to go off as I enter (whether delayed or not). The range seems good as the kitchen window must be a good 30ft from the shed and it does trigger the alarm consistently.
Just about does the job but a more comprehensive introducton to the system, consistency of operation and a much louder siren would make me a lot happier.