Safety agencies are warning not to buy electrical appliances, such as extension leads or multiplug adapters online if the retailer does not have a contactable Swiss address.
The Federal Inspectorate of Heavy Current Installations says it regularly checks items on sale and 11% are found to be defective.
They could cause shocks or fires.
It banned 117 items last year.
Consumers should also be careful of buying rechargeable batteries or chargers online.
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Mixed results in school classrooms
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Good news for household bills
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