SEIKO quartz metronome, adjustable beat and pitch. - Brand: SEIKO - Model Number: SQ-77 - Model Name: Quartz Metronome - Functions: Beat/Pitch Adjustment - Power: ON/OFF switch - Volume Control: Volume adjustment function I tested it with batteries and it works, but please note that I'm not sure if the tempo is accurate. I am an amateur, so I may have missed something during inspection. The period of use is unknown. Due to lack of specialized knowledge, I may not be able to answer specialized questions. The items in the photos are all that are included. Since it is used, please refrain from purchasing if you are sensitive to such things.