Please be aware that whilst a travel adaptor will allow you to physically plug a UK plug into a different socket it will not change the voltage or frequency of the supply.
Voltage - The mains voltage in Guinea Bissau is 220 V which is compatible with all UK appliances (UK voltage is currently specified as 230 V +10% / - 6%).
Frequency - The frequency in Guinea Bissau is 50 Hz which is the same as the UK.Need another travel adaptor? Search by Country
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