Metronome Tuner Tone Generator Function Digital Metronome Mini Portable USB Rechargeable Multifunctional for Musician Guitar, Piano, Trumpet, Pipes, All Instruments. Function & USB Rechargeable : Tuner, Metronome,Tone generator function . With 10 rhythm and 7 beat. Built-in rechargeable lithium battery, can be recharged through USB interface. MIC Pick up & Support Headphone : With microphone pickup, and can recognize 27.5Hz ~ 4186.0Hz sound. The metronome sound can be used with earphones. Powerful MetronomeFunction : With Pre-beat (Up beat) function. Player can have ready time to start the song. Vertical metronome, a direct view of be given. Two metronome sound mode : Human voice and Electronic beat voice. Intelligent Function : Auto power off function, the device turn off automatically if there is no signal present or operation in 5mins. Each shutdown can automatically save the current parameters. Wide Application: Extended frequency range for all instruments, can be used for Piano and wind music, twelve chromatic, guitar, bass, violin, ukulele and other instruments. Function : Metronome, Tuner, Tone generator. Pre-beat (Up beat) Function. Player can have ready time to start the song. Vertical metronome (downbeat indicator), a direct view of be given. Auto-off Function. The machine automatically turn off if there is no operation for 5 minutes. Saves settings upon power-off. Rhythm : 20 mode Beat : 7 mode PRE beat :1~6 Metronome sound: Human voice, tik tok, cowbell Tempo: 30~250bpm Tuning mode: Chromatic, Guitar, Bass, Violin, Ukulele Tuning precision: ±1 cent A4 range: 430~450HZ Tone Generator range: 2A-6A Generator precision: ±0.1 cent Power: Built in lithium battery Dimensions: 122(L) x 70(W) x 23(H)mm Weight: 110g Aroma AT-01A Tuner (Without battery) Compact size clip-on tuner for chromatic/ guitar/ bass/ ukulele/ violin. One-button operation, easy and convenient to use. LCD display, 2 colors backlight: green- in tune, white- out of tune. Rotatable design, allows you to have the best viewing angle. For helping you to find the accurate tuning of your instrument. Specifications: Model: AT-01A Tuning Items: Chromatic(C)/ Guitar(G)/ Bass(B)/ Ukulele(U)/ Violin(V) Pitch Range: 440Hz Tuning Accuracy: ±0.5 cent Power Supply: 1 * CR2032 Battery (not included) Item Weight: 18.5g / 0.7oz Note:The instrument showed in the picture is not included. Color: Black Material: Plastic+Metal Package Contents: 1 * Metronome 1 * Charging cable 1 * Chinese and English instruction manual 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.