This is a YAMAHA tuner metronome. My eldest son bought it for his trumpet in the brass band club, but he quit shortly after, so it's in beautiful condition. The box and instruction manual are missing, so everything included is what's shown in the photos: the main unit and the microphone. ※ From the manufacturer's description: The Yamaha tuner metronome TDM-710 is an item that supports the improvement of pitch and tempo to maximize the appeal of your performance. The large LCD with a 2-stage backlight can simultaneously display the tuner and metronome. You can practice using the metronome while checking the correct pitch. It comes with various modes to support practice, including "Sound Back," "Track," and "Focus." * Dual function that allows you to use the tuner and metronome simultaneously * Large LCD with backlight displays note names and rhythm * Sound Back Mode: Helps you develop your listening and matching skills * Track Mode: Allows you to practice aiming for stable pitch without relying on the tuner * Focus Mode: Allows you to grasp pitch trends more clearly * Long battery life with 2 AAA batteries * Made in Japan