Simple, effective quartz metronome features an easy-to-use dial, 40-208 BPM tempo range, an A440 reference pitch, sound and LED beat display, and a personal earphone. Three-way switch for sound and light, only light, off. Folding stand, uses 9V battery (not included). About 2 21/64" x 3 31/32" x 1 7/32".