This is a SEIKO clip-on tuner. SEIKO Clip-on Tuner STX1Σ Suggested Retail Price: ¥5,985 This is a junk item because the clip part is damaged (see photo), but it can still be used as a clip in its current state (in fact, I was using it like this). Instant purchase is OK. If you have any questions or requests for additional photos, please feel free to contact me. <From the product introduction page> "Arm clip" tuner that can be moved freely to an easy-to-see angle * The LED display lights up, making it easy to see the note names and modes, and tuning is possible even in dark places. * Includes a 1-octave reference tone oscillator. * Safe design with a new clip that is gentle on the instrument. * Built-in microphone allows tuning without attaching to the instrument. <Main Specifications> * 77(W) x 55(H) x 72(D)mm, 70g (including CR2032 battery) * Modes: Auto, Manual, Sound * Input method: Built-in vibration sensor, built-in microphone * Measurement range: A0 to C8 * Reference tone oscillation: C4 to B4 (12 tones) * Standard pitch: A4 = 415, 438 to 445Hz #ClipOnTuner #STX1N #STX1Σ #SEIKO #GuitarTuner