Feature: Specially designed for tuning Erhu With LED indicator lights Easy-to-read LEDs showing you which way to tune Specifications: Tuning Mode: Erhu Tuning Range: A to D2 (220 to 587.33Hz) Display mode: LED display Power Supply: 1 * CR2032 coin battery Color: Black Package includes: 1 * Erhu Tuner 1 * CR2032 coin battery