Check the listing for details. Electro Harmonix Small Stone Phase Shifter 1970's, works great!. Condition: Used, Made in United States. Listed at 180.00 USD. Cleaned and polished case, replaced hardware with new SS 4-40 screws (found one screw hole slightly over torqued, so be careful when installing a battery). Tested with both battery and external power, unit gave very clean and stable phase shifting in both modes of color switch.