Features: The LED indicator shows the working state of tuner, no battery needed, powered by DC adapter which is not included. Mini and portable, made of qualified metal material. Rubber pads on the backside is anti-skid, which enhances the stability and avoids friction. Great accessory for electric guitar, good quality with reasonable price, you're worth it. The tuner ensures that both your guitar's tuning and your tone are never compromised in a no-nonsense, low-noise and high-precision tuner that focuses on being IN tune. Specifications: Condition: 100% Brand New and High Quality Material: Metal & Electron Color: Black Size: Approx. 9 x 3.5 x 4cm / 3.5 x 1.3 x 1.5inch Tuning Range: A0(27.5Hz)-C8(4186Hz) A4 Range: 435-445Hz Tuning Accuracy: +/-1cent Pickup Method: Digital Signal Input Display: LED Tuning Mode: Automatic Power Supply: External DC 9V Adapter (not included) Weight: Approx. 190g Packing List: 1 x Electric Guitar Tuner 1 x User Manual Package List 1The LED indicator shows the working state of tuner, no battery needed, powered by DC adapter which is not included. 2Mini and portable, made of qualified metal material. 3Rubber pads on the backside is anti-skid, which enhances the stability and avoids friction. 4Great accessory for electric guitar, good quality with reasonable price, you're worth it. 5The tuner ensures that both your guitar's tuning and your tone are never compromised in a no-nonsense, low-noise and high-precision tuner that focuses on being IN tune.