KORG Humidi-Beat HB-1J-BK Portable Metronome with Thermometer and Hygrometer, Black

Power supply: 1 x CR2032 battery (3V) Lifespan: Approximately 80 hours (tempo 120, 4 beats, loud volume), approximately 1 year (clock mode) Dimensions: 90 (W) x 30 (H) x 16 (D) mm (main unit only, protrusions not included) Weight: 31 g (including) Accessories: Ball chain, operation confirmation (CR2032 x 1)