WyreStorm HALO 60 Bluetooth conference speaker Black 5.04 Mics Array, 3W Speaker, 5V 1A, 2500mAh, Bluetooth 5. 0 TRUE FULL DUPLEX, LIKE NEVER BEFORE A full duplex speakerphone allows multiple users to communicate simultaneously, while a half duplex one only allows one party to speak at any given time, just like a walkie talkie. Different from other half duplex speakerphones in the market, HALO 60 speakerphone boasts full duplex design, so everyone on a call can speak and be heard clearly and