The MT-40W has a Metronome, Chromatic Tuner AND Tone Generator great package.The HUGE display gives you all the parameters that you can adjust using the control buttons.Plug in your electric instrument, a pickup for your acoustic, wind or brass instruments into the 1/4 in (6.3mm) input 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,Tuning key:C, F, , Tuning precision:1 CentA4 range:430~450HzDetection :Mic, Line-inDisplay mode:LCD display, LED displayTuning :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 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.