Rockboard StageTuner ST-02, Chromatic 19"" Rack Tuner, For electric instruments, Tuning range: B1 (15.44 Hz) - C8 (4186.0 Hz), Sine wave, 2 Selectable tuning modes: Standard, strobe, Accuracy: +/- 1 cent, Reference frequency: 432 - 445 Hz (in 1 Hz steps), LED display, M4 threaded sockets on the back to attach RockBoard QuickMounts TYPE M (not included) and mount the tuner quickly and easily on a RockBoard pedalboard, True bypass, 2 Inputs: 6.3 mm mono jack socket, Output: 6.3 mm mono jack socket, Mains adapter connection: Hollow plug socket 2.1 x 5.5 mm (negative pole inside), Power supply via 9 V DC mains adapter (included in delivery), Power consumption: Max. 250 mA, Dimensions without rack-mounting adapter (W x D x H): 395 x 63 x 44.45 mm, Weight without rack-mounting adapter: 730 g, Incl. power supply unit, 2x rack-mounting adapters, 8x M4 screws for mounting the rack adapters or the optional QuickMounts (not included in delivery)