The top panel features a simple, tactile button layout for quick adjustments: How to Enter Pairing Mode in JBL Xtreme?
Turn on both speakers. Do not connect them to your phone yet.
When you first open your XERTMT speaker, you will typically find the following items: 1x XERTMT Portable Bluetooth Speaker
If the speaker freezes, crashes, or refuses to connect to any device, you must clear its internal memory cache. Turn the speaker on.
If you bought the speaker from Amazon, eBay, or AliExpress, message the seller directly. Many can email you a PDF copy of the manual.