1. Wired series: one of them as the main speaker, use a 3.5mm audio cable, one end is plugged into the headphone output port of the main speaker, and the other end is connected to the audio input/AUX interface of the secondary speaker, and the secondary speaker is switched to audio input/AUX mode after connection

2. Wireless series connection (only models with TWS function): Turn on both speakers and switch to Bluetooth mode; Click the "TWS" key, the blue light flashes to indicate that it has entered the TWS pairing mode, and the two machines will automatically start to connect and pair