1 (also labelled "L"): Restricts the transmission to 1st gear only, often called a "low gear". This is beneficial when a significant torque is required on the wheels (one example is, when accelerating up a steep incline); however use at increased speeds can operate the motor at an excessive speed, https://dallaslrsst.total-blog.com/a-simple-key-for-gearbox-auto-unveiled-59378376