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Features:1) PnP USB interface, compatible with USB1.12) Clear voice quality 3) Built-in DTMF dialing 4) Incoming call ring, easy for answering5) No sound card and extra power supply required6) Compact appearance design suitable for notebook7) Applicable for wide and compatible multi-calling platforms 8) Choosing proper platform to communicate between 2 USB IP phones, it can realizeconversation free of charge
