The wattage of your Bluetooth speakers determines the overall playing time and sound output. For example, lower-end Bluetooth speakers have a lower wattage because they have a single speaker. You'll have twin-channel speakers or a 2.1 sound with a subwoofer as you go up the price range. Here's a rule of thumb: the larger the speaker size and wattage, the more volume the speaker delivers. If you plan on hosting a party at home, go for a speaker with higher wattage.