... 2 . Four outputs , independent outputs.3. You can change the model free, from inching mode, squagging, interlocking, ... plug pin jumper in jog and easy to change the chip.4. High receiver sensitivity, remote control distance ... , Note:Inching mode: Press A button it work, release A it stop.Squagging: press A button ... it work, press A again it stop.Interlocking: Press A button it work, press B button ...