The SQ50 Seiko quartz metronome features virtually perfect tempo settings, and a A-440Hz frequency tone (standard A) that simplifies the tuning of just about any instrument. A tempo range from 40 to 208 beats per minute is easily set from the 39 position rotary dial. A red LED light can be selected for a visual beat or combined with a click sound for a visual and audible combination. Includes earphone jack. Operates on a 9V battery (supplied) and has adjustable wire stand attached that allows it to be used an any angle