Outdoor rechargeable speakers typically have three types of products:
Battery speakers/lever speakers, built-in batteries/lithium batteries, speaker diameters of 5 to 12 inches, generally equipped with MP3 players, microphones, Bluetooth, radio and other functions, typical mono product. They are all small brands, even the first x and new x ones are produced by small factories. Among them, the more common brand with more product models is the Guangzhou Temeisheng brand;
Plug-in card portable speakers , built-in small-capacity lithium battery, with mp3 playback, radio and other functions. The diameter of the speaker is within 2 inches, usually 2.0 or 2.1. It is small and can be put in a pocket. There are many brands, the well-known ones include Edifier, Longines, See you there, Follower, Doss, etc.;
Bluetooth speakers are similar to the second type, and many are mono. Not much to say.