The sq50-v Quartz metronome is an upgrade from Seiko sq50 and features new look, Easy operation tempo dial, adjustable volume, two selectable click tones (high and low), and two tone generators (a and Bb). dial-in virtually perfect tempo settings and an a=440 tone for tuning. Tempo range from 40-208bpm can be set easily from the two-position rotary dial. A red LED can be selected for a visual beat or combined with a click sound for visual and audible beat-keeping. Includes earphone jack.