Recently, the amount of Bluetooth devices that support A2DP source/ HFP capability has grown dramatically. Nowadays, most users might have multiple devices, such as mobile phones, tablets, soundbars, TV sets, game consoles, etc. (Please refer to Figure 1 / Figure 2.) Simultaneously, the TWS earbud is now the most popular audio/voice sink device. If solution vendors can provide an easier way of creating/maintaining connections and smoothly switching between source devices, it will end up helping users significantly. Thus, Multilink, called Multi-connection, became a mandatory capability in Earbud.