SE-PTN is specially designed for Stage. This has No Sound Loss by True-Bypass, and when tuning, this blocks the noise perfectly with Low-Impedance Mute output. Guitarist can read the display very easily with Big Size Dot-Matrix. The note flows Left and Right, so it is very easy to recognize tuning. There is no battery loss when bypass. Specs: Power supply: DC9V, Consumption: 28mA(active), 0mA(bypass), Dimension: 75.5(w) x 115.5(h) x 47.5(d) (mm), Weight: 290g (include battery)