T-H Marine - Additional Remote Control Unit f/2-Way Boat Alarm System - TWAR-1-DPT H Marine Additional Remote Control Unit f 2 Way Boat Alarm System TWAR 1 DP Protects your boat and valuable equipment from theft. Instructions TO ADJUST SENSITIVITY: just hold unlock button down until it chirps then hit lock button to adjust the sensitivity level. Factory default is level 3 with 5 being the most sensitive. Hit the lock button when you hear 4 chirps you are in level 4 and 5 chirps is level 5 which is the most sensitive then hit