A system for connecting an add-on device to a network device is provided. Each of the two forceps arms provides electrical current to the working regions and carries a fluid conduit for delivering irrigating fluid to the working region of the arm. All embodiments of the food retainer have shaft ends extending therefrom for rotatably mounting the food retainers on a rotary grill or rotisserie. The warning signal is conveyed directly to the patient via a bedside monitor and to the patient’s physician via remote connection to an external programmer device so that both are notified of the drug efficacy problems. The brake shoe assembly has a transverse curvature substantially in conformance with the radius of curvature of the bicycle wheel rim, thereby improving pad contact with the wheel rim. Therefore, it is possible to extend the length of the link piece without folding an extension portion or arranging a slit, as in the conventional continuous assemblage of pots, thereby making it possible to handle enlargement of the interval between the planted seedlings stably and reliably.