Boss SY-1

Nominal Input Level INPUT,
RETURN: -20 dBu Input Impedance INPUT,
RETURN: 2.2 M ohms Nominal Output Level OUTPUT,
SEND: -20 dBu Output Impedance OUTPUT,
SEND: 1 k ohms Recommended Load Impedance 10 k ohms or greater Bypass Buffered bypass Controls Pedal switch
GUITAR/BASS switch
TYPE knob
VARIATION knob
TONE knob
DEPTH knob
EFFECT knob
DIRECT knob Indicator CHECK indicator (Serves also as battery check indicator)Connectors INPUT jack: 1/4-inch phone type
OUTPUT jack: 1/4-inch phone type
SEND jack: 1/4-inch phone type
RETURN jack: 1/4-inch phone type
EXP/CTL jack: Stereo 1/4-inch phone type
DC IN jack Power Supply Alkaline battery (9 V, 6LR61)