The MT-40W has a Metronome, Chromatic Tuner AND Tone Generator 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, Tuning key: C, F, , 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: 4 x Tuner 4 x Pickup Only the above package content, other products are not included. Note: Light reflection 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.