The invention concerns a wrist-wearable electronic device comprising a slot antenna and a method of manufacturing the slot antenna. Such a device comprises an outer housing defining an assembly zone and a radio unit contained within the assembly zone. According to the invention the outer housing is made at least partly of conductive material and comprises an integral slot antenna formed in the conductive material portion thereof, the antenna being electrically connected to the radio unit. The invention provides a convenient antenna structure for wirelessly communicating wristop computers and the like.