Millenium RW500 metronome - tempo 30-280bpm, separate volume for quarter/eighths etc, LED display, start/stop button, line out, 30 user presets, attaches to cymbal stand, includes battery. Optional power supply not included (9V 500mA DC), Dimensions: 165 x 116 x 32 mm, Weight: 290 g (incl. Batteries), optional power supply: Thomann Universal Netzteil 3-12 V DC, article number 192043