A cooling and warming apparatus includes a housing having a top side with a number of open receptacles for receiving perishable items. A plug module has at least one plug pin which defines a plug end protruding out of the insulation casing and an inserting end opposite to the plug end received in the insulation casing. The received playout data is then utilized in the remote site by an inventory manager to direct control of proper playout of digital media data. The counterpart receiver responds to the coded signal received from the transmitter only when the user defined code received is identical with the one set in the receiver. This avoids having a single, large glitch in the output, and spreads multiple smaller glitches over enough time that some of the glitch energy can fall within the frequency range where the amplifier’s feedback circuitry can eliminate its noise.