• “30 W” refers to the power rating (typically ~30 watts RMS) for the speaker or speaker system.
• “2-in-1” often implies that two functions are combined: the speaker + the Bluetooth module (and/or integrated amplifier) in one unit (so you don’t need a separate amplifier or Bluetooth receiver). For example one product claims “3-in-1 with Integrated Amplifier, Bluetooth” for 30 W.