JM-60 Practical Mini Metronome: Features: *portable and attachable on music sheet stand, clothes etc. Convenient use makes you gratified and satisfied as you wish *Perfect functions with multi beats and rhythms for choice, great volume with fair and soft sound *Beat tempo operates with accurate floating point numbers and its exactitude can be precise to the 10th digit after the decimal with tolerance close to zero. *With clock function & be able to be used as a watch. Specifications: Beat :0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Tempo :30~250bpm Volume :Mute, low, medium, high Size :42(W)×57(H)×35(D)mm Weight :30g Power :CR2025×1(3V)