So we have bubblewrap sheets as sound traps but there could be alarm system options.
Broken Glass Alarm:
-The most simple of all the makeshift alarms. All you need is a number of Glass Shards.
-Should be noisier than Bubblewraps.
Bone Alarm:
-Made by setting up a number of bones in a similar fashion to a jenga tower or a tower of cards.
-Should be noisier than Broken Glass Alarm.
Can Alarm:
-Made by putting pebbles or similar things inside a number of cans and tying them together with a string.
-Should be noisier than Bone Alarm.
Talking Doll Alarm:
-Made by attaching a Talking Doll to a tripwire.
-Should be a bit noisier than Can Alarm.