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 Cent A4 range:430~450Hz Detection :Mic, Line-in Display mode:LCD display, LED display Tuning :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 Only 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.