The MT-40W has a Metronome, Chromatic Tuner AND Tone Generator all in one great compact package.     The HUGE display gives you all the parameters that you can adjust using the large control buttons.     Plug in your electric instrument, a pickup for your acoustic, wind or brass instruments into the 1/4 in (6.3mm) input jack or use the built-in microphone.     WIth all these important features, the MT-40W is tough to beat           Tuning range:A0(27.5Hz)~C8(4186Hz)     Tuning mode:Chromatic,Wind instruments     Tuning key:C, F, Bb, Eb     Tuning precision:±1 Cent     A4 range:430~450Hz     Detection method:Mic, Line-in     Display mode:LCD display, LED display     Tuning method:Auto     Tone Generator     Reference tone range:2A~6A     Reference tone precision:±0.5 cent     Metronome     Tempo range:30~250 bpm     Beat:0~9     Rhythm:      Tempo precision:±0.3%     Metronome sound:Electronic sound     Power supply:3V(2xAAA)batteries (not included)     Colour:black     Material:ABS+Electronics     Size:105 x 18 x 65mm          Package Contents:     1 * Tuner     1 * Pickup