Skylighter's line of stage and theatrical products can be used indoors and outdoors depending on the situation. They should only be used by trained professionals. Be sure and test every single effect or device you are using before using it indoors or in front of a live audience. The instructions that come with the products are important. They have been written by professionals who use these products and know how to use them safely. Pyrotechnic special effects can be quite dangerous even when used in small amounts, but especially if you exceed recommended sizes.