Swedish biometrics firm Fingerprint Cards has reported weaker operating profits, citing volatility in the market.FPC posted earnings below market expectations on Thursday and said delivery volumes would decline in the fourth quarter from the third due to seasonal effects.The company warned in September its revenue would be far below market estimates in the third quarter as the industry switches to cheaper user-recognition technology.It reported an operating profit of 52.4 million crowns ($6.4 million), lower than the 114 million seen by analysts in a Reuters poll and sharply down from 767 million in the year-ago quarter.