Features: 1.BLUETOOTH MUSIC PLAYBACK: The 2 in 1 electronic digital metronome with metronome and Bluetooth music playback provides 10 meter range transmission and low latency. 2.RHYTHMIC RANGE: The Metronome tuner has a rhythmic range of 30 to 260bpm, with rhythm from 0 to 9, covering all the essential needs for developing rhythmic skills in any musical genre. 3.SIMPLE OPERATION: Turn on the Bluetooth of your cell phone or musical instrument with Bluetooth voice frequency output, search for the device "AM?718" and pair it to connect easily. 4.1300MAH BATTERY: The Electronic digital metronome is equipped with a long lasting 3.7V 1300mAh lithium polymer battery for long hours of continuous use. 5.COMPACT AND PORTABLE: The Electronic vocal metronome is small and portable, easy to carry and use in the parks, on the patio and at home. specification:Item Type: Digital Metronome Material: ABS Rhythm Range: 30-260bpm Rhythm: 0-9 Battery Type: 3.7V Lithium Polymer x1 (Ship with Inbuilt Battery) Battery Capacity: 1300mAh PackageList:1 x DigitalMetronome (Ship with Inbuilt Battery) 1 x User Manual 1 x USB Charging Cable