The sprinkler includes the following structural members: a body with a channel for liquid supply, a thermally responsive unit with a valve closing the sprinkler outlet, and a thermally responsive unit attachment. The invention accomplishes this by use of a flexible planar cathode and a spacing pad thereon. Networking devices of the network are interrogated in relation to an operational status thereof. A video stream from an on-board camera is transmitted back to the operator station for viewing on a computer desktop display or a head mountable display. Plastic resin can be injected into the housing mold to form a housing of the electronic device, the plastic film bonding with the injected plastic resin to secure the display screen into the housing. The cart may include a frame which has an interior perimeter and the interior perimeter of the cart is smaller than the perimeter of the pan.