Abstract: A weather resistant, battery powered tripwire warning device includes a weather resistant housing, a battery mounted within the housing, an alarm mounted within the housing, at least one spotlight mounted on a side of the housing and configured to illuminate regions extending from the side of the housing, and at least one and preferably a pair of switches mounted on opposing sides of the housing and configured to close a circuit between the alarm and the battery when either switch is activated. Each switch is configured to be attached to a trip cord, such that a selected tension on the trip cord will activate the alarm. The tension required for activation of the switches is individually adjustable. The battery powered tripwire device may be employed for perimeter security of a military force or for training exercises.