this product calls itself a contact mic, which suggests it can be used for amplification of acoustic instruments for playing/recording through a PA.
Unfortunately, it clarifies on the box cover, after your receive it, that its only designed for a tuner. So if you try to use it on an acoustic guitar, you will be sorely disappointed with the sound level. Please be warned, ths is ONLY meant for a tuner for wind instruments apparently!!!! Refer pics attached before you buy. It's not a cheap mistake!