Compare the plug shapes, voltage and frequency in Haiti and Tonga, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Haiti, you will need a travel adapter for Tonga. Haiti uses Type A/Type B plugs, and Tonga uses Type I, so the pin shapes will not fit any wall socket. Voltages differ (110 V at home vs 240 V abroad), so check the label on each device. Most modern dual-voltage chargers handle the swing without a converter, but heating appliances usually do not. The mains frequency is also different (60 Hz vs 50 Hz). This rarely matters for electronics but can affect motor-driven devices like clocks and shavers.
Haiti (home)
Tonga (destination)
Electrical specifications in Tonga
More about plugs in Tonga
In Tonga, the standard power plug is Type I. The country runs on 240 volts at 50 Hz. That means every wall socket in Tonga is the same shape — Type I, and your plug needs to physically match the socket to fit.
Full Tonga plug guide