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 instrumentsTuning key:C, F, Bb, EbTuning precision:1 CentA4 range:430~450HzDetection method:Mic, Line-inDisplay mode:LCD display, LED displayTuning method:AutoTone GeneratorReference tone range:2A~6AReference tone precision:0.5 centMetronomeTempo range:30~250 bpmBeat:0~9Rhythm: Tempo precision:0.3%Metronome sound:Electronic soundPower supply:3V(2xAAA)batteries (not included)Colour:blackMaterial:ABS+ElectronicsSize:105 x 18 x 65mmPackage Contents:1 * Tuner1 * PickupOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.