A mixing and dispensing apparatus having a lid with an opening extending from a first side to a second side of said lid. The light source module comprises a plurality of light-emitting devices configured to emit lights of different wavelengths, and the controller is configured to drive the light-emitting devices to emit the lights to form the combination beam consisting of at least two lights of different wavelengths. An apparatus for determining fluid flow in a pipe having ultrasonic transducer sites. The demand-page related Ethernet frames are then delivered to the iSCSI target with a higher priority through the intervening Ethernet network than other traffic.