My chaperone will have all the info I have on whom I am meeting, they call or knock to check in every 15-30 minutes and if I don;t answer 911 is immediately called along with the front desk of any hotel I may be at. Simple, safe and effective. . . though really it is the screening process I use before I even meet anyone that generally keeps me safest. And I don;t take any work I am not sure about. No amount of money is worth my life.