It is an amazing tool!!!! It is suitable for guitar and singing, of course. It is perfect for someone who plays guitar (acoustic) and sings. It also has its effects, but don't expect anything great. It's not like you're going to use it for guitar effects... but I have to say that the effects it has on the vocal channel are impressive, especially the reverb which everyone needs to some extent.
Personally, I am a keyboardist, and I bought it mainly for playing on the street (busking), either alone or with others. It is perfect for this job for anyone interested... It works for 2-4 hours of continuous use with 8 AA batteries, depending on the batteries, of course. I recommend to those of you who are looking for this phase to also buy rechargeable batteries because, as you will realize along the way, batteries are relatively expensive and will always be a constant expense that you would wish you didn't have.
It helped me so much that it is so lightweight that I now use it as a personal monitor for gigs, instead of carrying the heavy PA...
Overall, you will love this little box. It is a tool for almost all purposes.

I connect a microphone and an electric guitar with excellent performance of Acoustic Simulation. I use it in ECO mode with 9 hours of continuous operation. There is the possibility of connecting a third instrument such as keyboards. There is also the possibility of connecting a fourth instrument to the input of the mp3 mini jack, as long as you have a preamp and a cable adapter to fit. Additionally, you can do a big live performance by connecting the amplifier from its 2 output jacks to 2 very large SELF-POWERED SPEAKERS. (powered by Merry Treismas BAND)