Correct but it depends on the application. The U.S. and Canada are 120/60 and Jamaica is 110/50. Both use the A & B style plugs, so no worries there. Most electronics will automatically detect the voltage and frequency and adjust accordingly. Take a look at the power supply on your curling irons or straighteners. If it says 50/60, 110/230 it should be a power supply that can work at a variety of voltages and frequencies. Your phones, laptops, tablets, etc should all be fine, as well as most other electronics.
An older record player that kept the speed based on the frequency may run at 5/6 the speed. Newer record players should take frequency in to account. Clocks back in the day used to keep time based on the frequency, now it is all digital. I won't go into how that works but you can look it up if interested.