Cherub Omnio Clip-on Metronome Tuner WMT-655 is a 3 in 1 (tuner metronome and tone generator) Metro-tuner with 20ms response time steady detection and accurate tuning. Using Cherub"s proprietary tuning software it tunes faster and more accurately than other tuners of its kind. A built-in speaker allows you to hear the beat and tone.