System. 2 3/4" x 1 1/4" x 3/4". A small and complete kit for campers, hikers, hunters, fishermen, and other outdoor enthusiasts. Includes 135 dB alarm module with built-in red flashlight and side blue LEDs for signaling; two 10m coils of monofilament trip line; two all purpose adhesive lights with polished aluminum surface for signaling day or night; two zip ties for securing alarm module to a branch or stake; and an 8" strip of 100 mph duct tape for multi-purpose use. Will alert you if an intruder has wandered into your camp. Requires 12v alkaline battery (23A, A23) included.