Wrist-wearable device comprising an antenna

A wrist-wearable device comprising:

• an outer housing with a back cover, a front cover being parallel to the back cover, and a circumferential wall there between, the wall being perpendicular to the back cover and to the front cover and being made of an electrically conducting material;
• and
• two slot antennas configured to send and to receive electromagnetic signals, each slot antenna comprising a case comprising electrically conducting inner surfaces and being fitted in the housing, the case being limited on one side by an outer face lying substantially in a common plane with the wall of the housing, a slot extending substantially in a direction perpendicular to the back cover and the front cover is formed in the outer face of the case, the inside of the case thereby forming a cavity of the slot antenna wherein a high impedance portion is provided in the circumferential wall between the outer faces of the two cases.