The DSS610Z replaces the BSS610Z Main features are: Powerful 360W maximum output, yet still with the extra-lightweight and compact design achieved by using Lithium-ion battery as power unit. Smooth and powerful cutting at the high rotational speed of 3,700 rpm delivered from enhanced motor. Easy to trace cutting line with: LED job light and built-in blow-off nozzle that directs sawdust away from cutting line. 22 minute charge time with the air cooled Makstar Optimum Charging System. Lithium-ion batteries have greater life spans than their Ni-MH or Ni-Cad counterparts giving 430% greater run time. Lithium-ion's 40% weight saving means 18 volt power can be obtained by a battery that weighs the same as a 12 volt Ni-MH battery. Double safety trigger. High comfort grips. Large .