1. Universal type, compatible with any type of sewing machine.
2. Powerful, quick response, save energy.
3. Multiple I/O connection available.
4. Control box size minimized & weight reduced.(W/O Transformer).
5. SM-250, SM-260 can be controlled by the same control box.
6. Control the sewing machine speed directly by measuring pulley size.
7. Diagnostic mode available to inspect the I/O status.
8. Popular, High Quality, Customer Approved.