From the manufacturer: 
The FV04 Harmony is the first effects pedal from Flamma aimed at vocalists and guitarists. The FV04 happily accepts guitar or microphone inputs and includes dedicated reverb effects for each. On the vocal side, the Harmony provides 11 different harmony modes to choose from and can comfortably shift between major and minor scales for ultimate pitch flexibility. The FV04 act as an all-in-one effects solution with the ability to choose between mixed signal or individual outputs to separate vocal and guitar channels. Support for 48V phantom power is also included as is the option to use the FV04 as a microphone amplifier. The FV04 runs on the included power supply and its sleek blue, all-metal shell is gig-ready and built to last.

Features

1. 12 pitches with 11 different harmony modes

2. Dedicated reverb designed for vocals

3. Supports Guitar-in with individual guitar reverb effect

4. Optional 48V phantom power

5. Can be used as a microphone amplifier or a traditional stompbox.

6. Two different output modes for mixed signal or individual signal from guitar and microphone