Description MAIN FEATURES: Built-in program reference panel – 664PRO only Automatic tension release Built-in 2-thread converter LED lighting Self-threading lower looper Color coded thread guides Adjustable cutting width 3.0 to 7.0 mm Adjustable stitch length from 1 to 5 mm Adjustable differential feed from 0.5 to 2.25 Maximum sewing speed adjustable up to 1,300 spm TECHNICAL FEATURES: Programs             4/3/2 threads Built-in program reference panel – 664PRO only Thread tension manual 2-thread converter integrated Tilting needle clamp Instant rolled hem device Lower looper – easy threading Safety system Pre-tension slider (3/4 – 2 thread) Color coded for easy threading Cutting blade Foot pressure adjustment Presser foot – Snap (clip) on type Lighting LED Thread guide telescopic antenna Waste tray – 664PRO only SEWING FEATURES: Adjustable stitch length from 1 to 5 mm Adjustable cutting width from 3.0 to 7.0 mm Adjustable differential feed from 0.5 to 2.25 Maximum sewing speed 1300 spm Cover hem stitch STITCH PROGRAMS: 4-thread programs – safety, stretch knit, gathering, stretch wrapped 3-thread programs – thread wide, overlock, narrow hem, rolled hem 2-thread programs – rolled hem, overcast, flatlock STANDARD ACCESSORIES: Accessory box (664) Exclusive Elna accessory box (664PRO) Built-in storage compartment (664PRO) 2 thread converter (664PRO) Screwdriver (large and small) Needle set Tweezers Lint brush Thread nets Spool caps Oiler Upper knife (664PRO) Spanner (664PRO) Tension release clip (664PRO) Thread guide (664PRO) Waste tray included (664PRO) Needle threader Electronic foot control Dust cover