The BSWM -160 DUAL is designed for use in situations where 2 batteries are used; for example in boats, campers and caravans. The Battery separator is a microprocessor controlled high capacity mechanical switch with vibration (i.e. motion) detection. Since every vehicle (EURO 5/6 engines) has its own vibration frequency and amplitude, the user can set the sensitivity of the BSWM however it can also be used in vehicles with the “old” type of alternators. IP-67 and E-approved.