YAMAHA YAMAHA ME-D1 digital metronome (Japan Import) Goods weight 186 g Size of goods 9 x 7.9 x 7.6 cm Battery life: About 50 hours Tempo tone: 0.1%Sound pronunciation range: B 442 Hz/440 Hz, A 442HZ/440Hz The speaker attaches this to right and left. This may have somewhat large volume.When using it in the park etc. which do not rebound sound, you use a high click sound of a pitch, Sound may pass well.