While it retains the original sounds, there are several modern upgrades to improve performance, reduce extraneous background noise and add versatility:
Metal film resistors and caps for quieter performance
NOS matched germanium transistors for consistent, reliable tones
Wider fuzz range, more than twice the original
Smaller footprint, true bypass switching with LED indication and power supply compatible
This device can be powered by a standard 9 volt DC power supply intended for musical instruments with a negative center 2.1mm barrel or a 9v battery. Even though this pedal is a germanium fuzz, it will play nice on a daisy chain due to its internal voltage regulation.