Metronom MT-400 black Cheque card metronome, LCD-display with pendulum simulation, 30 - 250 beats Optic and acoustic indication, Tuning: A435 - 445 (in 1Hz steps) 10 beat variations, With battery: Lithium (CR 2032) Earphone socket, Dimensions: 58 x 89 x 9 mm. Digital Quartz Metronome (Series 866) silver-coloured, Credit card size, Tempo Range: 30–250 Beats/Minute, 11 variable Beat- and Rhythm Settings, Tempo Selection: In steps of one, Beat Indication: Visual LCD and/or audible Beats, Accuracy Metronome: ± 0,02 %, Reference Sound:1 octave (C4–H/B4), Pitch Range A 435 Hz–445 Hz, Terminal: Earphone Jack: Monophonic, 2.5 mm (0,1“) dia. plug, Battery: Long Life Lithium Battery (CR 2032).