The positives are:
* Includes a clip-on piezoelectric microphone
* Includes AAA batteries
* Has a plug for connecting to an electric guitar
* Has a plug for headphones and volume control
* Has a microphone
* The screen is illuminated and changes color as a tuner
* Functions as a metronome
* You can change the frequency of A from 410Hz to 490Hz, for example 432Hz or 440Hz
* Has a relatively large size of 100x70x18 with a 2.4" screen
* Takes AAA batteries that are sold everywhere, you can use rechargeable ones and they last longer compared to CR2032 and 9V batteries.
* Costs 1/3 compared to popular and branded electronic metronomes

Negatives:
* Loses accuracy as a tuner
* Does not support alternative tunings in guitar mode, only supports chromatic mode
* As a metronome, the beeping sound resembles a monitor in an ICU
* As a metronome, it does not have a moving indicator from left to right like a mechanical one, but a Christmas effect of a jumping Santa Claus

I bought it for the metronome function and due to the negatives, I use it based on the sound and the LED lights. I think it is good for beginners who have bought a cheap guitar (like me) and do not want to spend more money on accessories (tuner, metronome, guitar stand, strap, picks, case).