Using Cassida patented "M" Algorithm, the Quattro offers outstanding counterfeit detection combined with the lowest "false reject" rate of any manufacturer. Insert a bill in any of the four possible orientations and the Quattro will verify its authenticity, other detectors can only verify cash in one orientation. Backed by Cassida "Counterfeit Shield "; if a counterfeit bill is accepted as Genuine, Cassida will reimburse you the full value of the bill within 72 hours. Compact, durable and portable, the Quattro is designed for use anywhere counterfeit detection may be needed and its rechargeable battery means access to power is not required.