Boss BD-2-B50A Bluesdriver 50th Anniversary ltd. Ed. Effect Type: Overdrive Technology: analog Special Features: 50th Anniversary limited Editon Mono / Stereo: Mono In, Mono Out Controls: Level, Gain, Tone Switches: On / Off Bypass Mode: Buffered Bypass Including: Battery 9 V Block Power supply: 9 VDC, Center negative Power Consumption: 9 mA Battery powered: Battery Powered Battery Type: 9 V Block