(completely Safe when used as described) This particular device, when used outdoors, serves as an effective early warning signal against intruders on your property. This system is all steel construction that can be used over and over. Designed to accommodate both 12ga. blanks and 12ga. pepper. Kit contains all the necessary hardware to install where required(tree, fence, post, etc). Includes one 12ga. blank cartridge. Item can only function with rounds listed below. This ammo is restricted in the following cities and/or states: All of Alaska; Los Angeles, CA; Sacramento, CA; San Francisco. CA; All of HI; All of IL; All of MA; NYC, NY; Bronx, NY; Brooklyn, NY; Manhattan, NY; Staten Island, NY; Queens, NY; Washington D.c., APO & FPO Addresses, No PO boxes.