American shoppers will have to pay between $1.6 billion and $3.2 billion more for connected devices such as gateways, modems, routers, smart speakers, smartwatches and other Bluetooth enabled products.

The five per cent increases, which will take the tariffs to 15-25 per cent, and are due to roll out in stages through December and target some popular items, such as laptops, mobile phones and some shoes.

WASHINGTON - Washington is planning another tidal wave of tariffs on Chinese imports that represent a worst-case scenario for markets and major industries on both sides of the Pacific.