Millisecond pulsar binaries at transition

Millisecond pulsars (MSPs) are formed from low-mass X-ray binaries. Recently, two MSP binaries are found at probably the end of their X-ray binary evolution. Unique properties are learned from studies of them, particularly about their transitions between the states of active accretion and accretion-disk free. I will review the learned multi-wavelength properties of them and the implication for the evolution from low-mass X-ray binaries to MSP binaries.