Core 2 is the ultimate practice companion for all musicians and makes your music practice (almost) addictive. Access five professional music tools - a vibrating metronome, practice tracker, chromatic tuner, decibel meter, and smartwatch - all in one revolutionary device. Size 45.5mm / 1.7 in Weight 34g / 1.2 oz (Core), 68g / 2.4 oz (Core Steel) Case material Polycarbonate (Core), Stainless steel (Core Steel) Wheel material Aluminium (Core), Stainless steel (Core Steel) Glass material Tempered mineral glass Strap size Fits wrists with 140mm - 210mm / 5.5 in - 8.3 in Water resistance Splash resistant (IP65), protected from rain and water splashes (but no showering!) Battery 4+ days in watch mode, or 3+ hours of metronome playback (200 mAh lithium-ion battery) Display 2x Monochrome OLED, 0.68 in, 96x32px Sensors G-sensor for raise to wake function LEDs 1 RGB LED in center, 8 RGB LEDs in outer ring Capacitive touch Supported languages English, German, Spanish, French, Italian, Chinese (simplified), Chinese (traditional), Korean, Japanese