How it works
A 15/16 time signature metronome counts the sixteenth note, fifteen to a bar; 240 here is quarter note = 60. It opens on 4+4+4+3, the division Wikipedia's list of works in unusual time signatures gives for two works.
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Start
Tap the pad, or press Space. Clicks one, five, nine and thirteen are raised, one the highest. A second tap stops it.
Change the tempo
Tap the number under the pad and type four times the quarter-note mark, since every click is a sixteenth note: 90 goes in as 360. Minus and plus move it by one, up to 1000.
Questions and answers
What does 15/16 mean on a metronome?
Fifteen sixteenth notes to the bar. In Wikipedia's Time signature article the lower figure names the note being counted, with 16 standing for the sixteenth note, and the upper figure says how many make a bar. This 15/16 metronome clicks all fifteen.
Is 15/16 a bar of 4/4 with a note missing?
In length, yes: 4/4 holds sixteen sixteenth notes and this bar fifteen. Grouped 4+4+4+3 it runs as three quarter-note beats and a fourth that is one sixteenth short, so at 240 the raised clicks fall a second apart until the bar turns early.
Which pieces divide 15/16 as 4+4+4+3?
Wikipedia's list gives two, each referenced to its score: sections of two numbers in a 1986 stage musical, and bars 501 and 535 to 536 of Louis Andriessen's De Staat, where it notes that some layers of bar 501 run 3+3+3+3+3 and 3+4+4+3.
How else is 15/16 grouped?
In Bulgaria, as seven beats: Wikipedia's article on Bulgarian folk dance writes buchimish, a line dance in 15/16, as 2+2+2+2+3+2+2. The list of unusual time signatures also has a passage for solo cello divided 5+3+4+3. This pad plays 4+4+4+3 only; elsewhere follow the highest click.
Why can't I hear the metronome?
Three things on a phone can mute it: the ring switch, a volume of zero, and Bluetooth headphones that have taken the sound. The page cannot tell which, but its fifteen dots keep time in silence, larger on one, five, nine and thirteen.