Sonic Sentinel M14-1 Propane Sound Cannon & Tripod Effectively repels birds and other wildlife with 130 decibel sonic blasts Included heavy duty, fully collapsible 36" tripod increases cannon's coverage up to 10 acres, depending on crop and topography Included long lasting battery stays strong even through winter using high-output solar charge system 20,000 blasts per tank of propane, with weather proof sealed electronics make it virtually maintenance free! Included timer features two random modes AND fast multi-shot capability (1,2, or 3 shots)