... color unique metronome and practice drum 2 in 1 digital electronic drum pad Specification:Tempo range: 30~280bpmBeat: 0 ... ,1,2,3,4,5,6,7,8,9Tolerance: ... : 3*AAA Battery or 9V AC adaptor Feature: 1.Patented product,novel design,unique 2.TRP environmental drum ... green color unique metronome and practice drum 2 in 1 digital electronic drum pad