105 BPM means 105 beats every minute: one beat every 0.57 seconds (571 ms), or 1.75 beats a second. In classical terms it is Andante, at a walking pace (76–107 BPM).
You often hear tempos around 105 BPM in pop, funk, soft rock and filmi dholak grooves. The metronome above is already set to 105 BPM in 4/4: press Start, and change the time signature, accents, subdivisions or sound if your song needs it.