It is a Tuner / Mtronome which I only use the function mtronome.
It possde output minijack MONO jack and from the tuner.
Requires 2 LR03 batteries.
A button "ON / OFF", which went from a "Mtronome" "tuner", a "function" (measurement time of 1 7, rhythmic figure: note, sixteenth note, triplet, ...) and a "Mute".
Of 40 208 bpm.

Bought new about 30 euros beginners 2005.

For part Mtronome:
It crashed immediately APRS have bought.
First is the HP Mini stopped working, and there was no sound at all even the headphone output.
The first inconvnient is that every time you put it on or we enlve mute, the first tone is overpowering and the sound level dcroit gradually until stabilize. The danger is to explode the ears each restarting (I screwed up even a small bass amp branch on which he silent because of a).
The other is the mono output inconvnient result that unless you go through a table, it was the tone in one ear. Add the absence of a CONTRL volume.
The last inconvnient is its fragile construction trs (dj 2 failures!).
Finally, I have a friend who has exactly the same and it was noted that not only the two mtronomes did not even beep sounds but also that the tempos taient totally diff ent. In the same rglant on BPM, it's one that y 'is much faster than the other (the diffrence is about 10bpm).
Intolrable for mtronome!

For the tuner part:
It is wrong. It gives some Hz low even by rglant on "The 440".

In short, it's m. .. With the exprience I would choose another.