We have just released sound module that can play any mp3 file from USB stick. Put it in your room and scare/amaze/surprise your players! https://www.escaperoomsupplier.com/product/sound-universal-12-inputs/
Companies offering Escape Room franchise
Companies which design and build Escape Rooms
Companies offering help in preparing business plan, getting funding, marketing., etc.
Companies offering Escape Room online booking management systems
Escape Room prop producers and shops
Facebook groups, reddit sites, forums, blogs and other resources dedicated to escape rooms