This Emax brand 6Amp ESC unit is designed specifically for 2S Operation so it will work for 2S only - not 1S. Emax is a well known and trusted brand for ESC units and servos and this ESC is from their Simon K range. As a Simon K unit, this ESC is fully programmable (separate programming card required). It also has many features which can be adjusted using stick positioning. The motor and battery wires are 70mm long.