Deyun Shi told a magistrate on Monday that he wanted to consent "as soon as possible" to extradition.
Acting on a request from U.S. Officials, Hong Kong police arrested Shi after he arrived in the semiautonomous Chinese city by plane.
US investigators believe Shi killed the teens before fleeing because he was upset his wife wanted a divorce. He declined the services of a duty lawyer and planned to represent himself.
The case was adjourned until Feb. 11.