A plurality of devices and a device system are disclosed, in which a plurality of input devices generate an input AV signal, a related device records and reproduces the AV signal, and a display device displays the AV signal. The dispenser is electronic in operation and has the ability to control the speed of its pump according to environmental conditions including the viscosity of the liquid being dispensed. A selectively foldable seat mounts to an underside of the bed frame and has a linkage and folding legs actuatable independently of the bed’s folding linkage. To improve the adhesion and lubricating performance, functional PFPE can be used. The refresh or update frequency for the cache may be defined by a user of the device.