A liquid type identifying method and device for correctly and quickly determining whether or not a liquid is a predetermined one. The radio handset determines quality of service requirements of an application currently executing on the radio handset and selects a pre-defined sleep mode mask from among a plurality of pre-defined sleep mode masks wherein the selected pre-defined sleep mode mask provides the closest available match in terms of sleeplisten pattern to the QoS requirements. The system further includes a recipient client executable on a second electronic device in communication with the server. The path length information generating circuit is connected to the two receive inputs of the receiving device though high impedance elements, and the path length information may be utilized by hardware or a processor to set the equalization or pre-emphasis in the receiver andor driver. The accommodator is formed to have a tubular length sufficient to insert at least two plane parallel plates. The shape determination section includes a design rule check section to determine a design-rule violating part as the necessary part based on design rules stored in a design rule database.