Plug Type in Jamaica

In short Jamaica uses Type A and B sockets, running at 110 V and 50 Hz. Jamaica is a genuine oddity: 110 V at 50 Hz, a pairing almost nowhere else uses. Anything with a mains-synchronous motor or an old mechanical clock will run slow. At 110 V, a 230 V-only appliance will run feebly rather than fail dangerously, but it will not work properly. Most modern chargers read 100–240 V and are fine either way; the label on the brick settles it. The distinction to hold on to is that a plug adapter and a voltage converter are different objects: the adapter changes the shape so the plug enters the socket and passes the local mains straight through, while the converter changes the voltage. Almost everything sold as a travel adapter is only the first, which is exactly why it cannot protect anything. Frequency — 50 Hz here — matters much less than people expect, because any device with a switch-mode power supply converts the incoming mains to DC immediately and ignores it. It affects mains-synchronous motors and old mechanical clocks, which run proportionally fast or slow, and very little else.