Place two of these near each other to create an alarm trap.
No tips here yet — be the first survivor to leave one.
Leaving tips is for survivors on the rewards list — reserve your rewards with your e-mail once and the form unlocks everywhere.
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C4 Remote Detonator 
Camera 
Chainsaw 
Charge Lantern 
Climbing Pick 
Compass 
Electronic Binoculars 
Empty Cryopod 
Fish Net 
Fishing Rod 
Flare Gun 
Glow Stick