Yes, you can pair 2 speakers together (also called True Wireless feature).
Here is how to proceed:

-1). Press and hold the TWS button of either speaker for 3 seconds, then release, TWS connection will be made with the master speaker. By default, the speaker which connected to your smartphone is the master speaker (R channel), the other one is the slave speaker (L channel).
-2). In TWS mode, press and hold the TWS button for 3 seconds on either speaker or power off the speaker to exit the TWS mode.