@Alex Hi Alex, the help or assist mode, basically stops screws stripping or cross threading.
This is how Makita explain it.
New impact mode (A-mode): helps to eliminate "screw cam-out" and "cross threading“ by driving at low speed until the start of tightening
T-mode: Tightening mode for self-drilling screw
Electronic 4-stage impact power selection.
Brushless motor Electric brake
Variable speed control by trigger Forward / reverse rotation
LED job light
Compact overall length of 117mm
The four function mode drills I have are the Makita DTP141, I have had mine a few years, they used to do a non brushless version which I think was the DTP140. I was about to buy some when I’d heard a brushless model was available and bought the brushless instead.
Apparently, they have only just become available in some countries but I think those may be non European countries. I’d imagine they are available in Holland though.
Very handy tool in my opinion.
This is the spec on them:
Easier mode selection and higher durability of the selection mechanism obtained by changing the selection mechanism from lever to change ring style
Single LED job light with pre-glow/afterglow functions
Battery fuel gauge
Ergonomically designed handle with rubberised soft grip fits your hand perfectly to provide maximum control and comfort.
More compact and lightweight design achieved by using BLDC motor and electronic clutch mechanism. Compared to model BTP140: • 14mm shorter in overall length. • 4mm smaller in motor housing diameter. • 0.1kg lighter in weight.
4 Operation modes for Ultimate Versatility. • Impact driver. • Percussion drill. • Drill (2 Speed). • Screwdriver able to drive Teks screw.
Electronic Clutch Mechanism: • Features expanded Clutch torque range 1.5-8.0Nm for wide range of applications. • Adjusts rotational speed preset torque in order to prevent over tightening. • Able to drive Teks screw at 1900rpm in high speed mode.