Brushless motor delivers more run time. XR Li-Ion batteries with fuel gauge provides more capacity. DCD790 20V Max 1/2"drill/driver compact (7.2" front to back), lightweight (3.5 lb) design fits into tight areas. DCF886 20V Max 1/4" impact driver compact (5.6" front to back) design fits into tight areas. Both tools feature LED lights with 20 second triggerrelease delay providing increased visibility in dark or confined spaces.