Boss compact pedals were originally produced in Japan, until circa 1990 when production moved to Taiwan. Earlier units came with a metal screw securing the battery compartment, later models retained the metal screw, adding a plastic knob for tool-less battery removal. The labels on the bottom of the pedals come in several different colours including black, silver, green, pink and blue. Apart from this the basic design has remained unchanged for over 25 years.
The DS-1 Distortion, however, is an exception; the design has changed significantly twice throughout its lifetime. The first time was around 1994 when the Toshiba TA7136AP op-amp was replaced with the Rohm BA728N. In 2000 the op-amp was again changed. This time it was replaced with the Mitsubishi M5223AL. The latest op-amp change occurred in 2007, when new DS-1 pedals began shipping with the NJM3404AL op-amp.
In recent years older Boss compact pedals have begun to command a high premium on the used market. Some pedals, such as the relatively rare VB-2 Vibrato, SG-1 Slow Gear, SP-1 Spectrum, DC-2 Dimension C, PS-3 Digital Pitch Shifter/Delay, and either of the two analog delay pedals, the DM-2 and DM-3, are highly sought