Nano technology is a proprietary technology from DEWALT that combines longer life, lighter weight, greater performance, and an expanded system of tools. Delivering 2,000 recharges, DEWALT's nano -phosphate lithium ion cells deliver industry leading durability and cycle life. Two to three times more than any other formula of lithium ion tested. The dcx6401 36-Volt 4 tool kit with nano technology features the dc900 36-Volt 1/2-Inch hammerdrill/drill/driver with nano technology that is powered by a combination of a high-efficiency DEWALT-built motor and exclusive 36-Volt nano-phosphate lithium ion battery. The dc900 36-Volt hammerdrill/drill/driver has a 1/2-Inch self-tightening chuck and patented 3-speed all-metal transmission. The dcx6401 also has the dc300 36-Volt circular saw with 7-1/4-Inch carbide tipped blade and rip fence for increased cutting capacity at 45 and 90-Degrees. The dc305 36-Volt cordless reciprocating saw with 4-position keyless blade cl-Amp allows for flush cutting and increased versatility. The dc509 36-Volt flexible floodlight provides hands-free use. The dc6401 kit includes 4 tools, 1-hour charger, 360-Degree side handle, (2) 3-Volt batteries, rip fence, 7-1/4-Inch carbide tipped circular saw blade, reciprocating saw blade and heavy duty kit box.