The AW-LT100 provide stunning battery life with approximately 100 hours of operation using a single AAA battery. The body's lightweight design features triangular shuttle switches that allow intuitive operation. The AW-LT100M is equipped with a large clip that can be attached to a variety of orchestral instruments such as a clarinet, sax, oboe, bassoon, horn, euphonium, tuba, cello, or contrabass. Also works for trumpet and trombone, but a model with a smaller clip is also available, see item 118354.- the manufacturer/cdp