A tag and a method of manufacturing a tag having an electronic device, which may be a transponder embedded in binding material, the method including applying a pre-coat of binding material to the transponder, at least partially curing the pre-coat of binding material, locating the resulting pre-coated transponder in further binding material and curing the further binding material. The method may further include applying a vacuum to the binding material and binding material, heating the binding materials and vibrating the binding materials. Apparatus for producing tags is also described and claimed. The tag has a construction which facilitates subcutaneous introduction into a target subject, such as an animal, and helps provide retention of the tag in the inserted position in the target subject.
