A device that may be worn by a person, or fitted to an apparatus for monitoring, sensing or controlling one or more parameters such as, but not limited to, moisture, temperature, heart rate or respiration rate, or controlling various parameters of electronic functions. The device includes a) a flexible substrate (10) that can be worn by a person or fitted to an apparatus and wherein the flexible substrate requires disposal or replacement with a fresh flexible substrate or requires maintenance that prevents continuous use of the device. b) An electrical circuit having separate first (11) and second (16) parts, where the first part (11) is carried by the flexible substrate (10) and the first (11) and second parts (16) can be connected together to form an electrical connection (13,14) and disconnected to allow the parts to be reused or disposed as desired.
