5 in 1 - Digital Dual Metronome (Tempo Range 30 to 250 BPM), Auto Chromatic Tuner (Suitable for all types of instruments and voice, built-in mic for acoustic and input jack for electric instruments or transducer, pitch shift 430Hz to 449 Hz, 1Hz shift. 3 color LED shows in-tune or miss-tune, LCD meter indicates how closely it is tuned in cents scale, Tuning range 0A to 7B), Digital Guitar Tuner, Thermo-Hygro meter (Temperature +14 Degree F to 140 Degree F, Relative Humidity Range 20% to 90% with recording function) and Reference Pitch Generator (88 notes, Chromatic scale). Physical Specifications: height=146mm, width=62mm, depth=24mm. Power Source: DC 9V dry battery or 9V AC adapter. Made in Korea.