Square Battery Distribution Cluster f/Single Engine w/Two Battery BanksThe 716-SQ-140A-DVSR is an ideal replacement for a battery selector switch. Just remove the selector switch and connect the existing wires to a 716 cluster, no extra wires are required for a fully automatic battery management system. To be used in single outboard dual battery bank or single alternator inboard engine dual battery bank. No more flat start batteries Electronics protection from harmful engine start spikes The 716 cluster is for use on charging systems up to 150A The 716 cluster replaces battery isolator systems WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.