The Ringline IS 2 Channel Reciever with DC supply is an optically isolated, DIN rail mountable ringline monitor with 2 change over relay outputs each following the status a single ringline channel. This model is powered powered by a 24VDC supply. Although originaly designed to provide sequence control for converyors, The unit may be used for any application requiring output of ringline channels. This unit is in a smaller box than the RLISRX2_AC so if 24VDC is available this box is ideal.