Made by Korg. This handy palm-sized tuner is a great inexpensive aid for pipe bands in tuning drones and setting the Low A on chanters. Also useful as an individual reference. A0 (27.50Hz) - B7 (3951.07Hz) - Tuning Mode: AUTO, MANUAL - Calibration Range: A4=430 - 449Hz (1Hz steps) - Power: 2 AAA batteries (sold separately) - Battery Life : approx. 100 hrs with alkaline battery on continuously - Dimensions 2.4" (W) x 3.8"(H) x .6"(D)