A leadless intra-cardiac medical device is configured to be implanted entirely within a heart of a patient. In other aspects the application discloses the use of these compounds, in a method for therapy and to pharmaceutical compositions comprising these compounds. The holder member is supported in the opening portion. The external sensing circuit detects a contact between the capacitor housing and the external electrode and sends a signal to disconnect the capacitor from an apparatus circuit. Hopper further provides drinking water to visiting birds, which is dispensed by water reservoir. The sensor then transfers sensed values electronically to a digital conditioning board.