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• Tired of Underperforming Clip-On Tuners? Tired of buying batteries for your Clip-On Tuner? So Were We... Meet the EcoTuner, the Last Tuner You'll Ever Need! (and you won’t have to buy batteries either) Note: EcoTuner Must be clipped onto instrument to properly function. EcoTuner at a Glance: Powered by a rechargeable 3.7v/110mAH internal battery High sensitivity piezo sensor for blazing fast & accurate tuning Brilliant full-color display that's easy-to-read Multi-point screen adjustability for the best viewing angle Improved clip design provides superior hold while protecting your instrument's finish Dedicated modes for guitar, bass, violin, ukulele, and chromatic for all other instruments Power save feature for extended battery life Easy to use for beginners, robust enough for pros Specifications: Tuning Modes: Chromatic (C), Guitar (G), Bass (B), Ukulele (U), Violin (V) Tuning Range: A0 (27.50Hz) – C8 (4,186.01Hz) Tuning Precision: ±.5 cent Reference Pitch Calibration: 430-450Hz (1Hz steps) Pitch Detection Method: Piezo Sensor Display: Full Color LED-backlit LCD Display Energy Save Feature: Automatic Power Off after 3 minutes of no sound/button engagement Power Source: 3.7v/110mAH internal battery Tuner Body Size: 82 x 36 x 31 mm / 3.2 x 1.4 x 1.2 inch Weight: 58g / 2.05 oz