Dr. Beat DM-90 metronome
Dr Beat DB-90 is loaded with features. It is probably the loudest metronome, so you can hear it over a sextet trying to play Brahms. It has a human voice so when a distinct downbeat is not enough for you, you can set it to speak ONE two three four…. It can get a group back on track in a hurry. Tempo 30-250, 30 kinds of patterns, reference pitches in 5 octaves, and more. 4.75″ wide, 6.25″ tall, 1.25″ deep. Operates on a 9-volt battery and has auto shutoff. Does not come with adapter (but it is sometimes in stock here).