Compare the plug shapes, voltage and frequency in Japan and Eritrea, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Japan, you will need a travel adapter for Eritrea. Japan uses Type A/Type B plugs, and Eritrea uses Type C/Type E/Type L, so the pin shapes will not fit any wall socket. Voltages differ (100 V at home vs 230 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.
Japan (home)
Eritrea (destination)
Electrical specifications in Eritrea
More about plugs in Eritrea
In Eritrea, the standard power plug is Type C and Type E and Type L. The country runs on 230 volts at 50 Hz. That means wall sockets in Eritrea can be one of 3 different shapes — Type C, Type E, Type L, and your plug needs to physically match the socket to fit.
Full Eritrea plug guide