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I've often considered Electro-Harmonix the coolest mainstream manufacturer of effects pedals and this new product is further proof. The Voice Box is both a vocoder and harmonizer unit with mic and instrument inputs. Along with built in reverb, tone control, and phantom power this unit provides "gender" changing options. From the product page -

The harmony processor creates 2- to 4-part harmonies directly from your vocals, in the same key as your accompanying instrument. Studio-quality reverb lets you independently add depth to your dry and harmony vocals.

The focused 256-band articulate vocoder, designed by the same EMS genius who made vocoding famous, features adjustable harmonic enhancement and controllable formant shift.

• Harmonically matches any electric instrument you plug into it
• Professional quality pitch shifting algorithm produces realistic harmonies
• The Low & High Harmony independently produces two harmony notes: 3rd and 5th
• 9 accessible programmable presets
• Natural Glissando
• Gender Bender knob allows for male/female formant modification
• Built-In Mic Pre with Phantom Power & Gain Switch
• Balanced XLR Line Output: Interface directly with any mixing board or A/D converter
• US96DC-200BI power supply included