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 Only 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.