Compare the plug shapes, voltage and frequency in Benin and Sri Lanka, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Benin, you will need a travel adapter for Sri Lanka. Benin uses Type C/Type E plugs, and Sri Lanka uses Type G, so the pin shapes will not fit any wall socket.
Benin (home)
Sri Lanka (destination)
Electrical specifications in Sri Lanka
Voltage
Frequency
More about plugs in Sri Lanka
In Sri Lanka, the standard power plug is Type G. The country runs on 230 volts at 50 Hz. That means every wall socket in Sri Lanka is the same shape — Type G, and your plug needs to physically match the socket to fit.
Full Sri Lanka plug guide