Full intelligent mode: Machine sews automatically. Semi-intelligent: This is when the machine works with an automatic sensor, automatic presser foot lifter, and auto thread trimmer. Computerized mode: You are able to adjust the speed of the machine.This improves the durability of the needle bar and is guaranteed to prevent oil leaks to ensure your works come out looks professional. If you desire to sew on an industrial overlocker machine but your space is limiting you to stick to a domestic machine, then this machine will be perfect. It has a much smaller table and unit stand but is the same industrial overlock machine.