1、The tuner is universal, widely used in guitar, bass, ukulele, violin, banjo and other stringed instruments. 2、This tuner is rechargeable and has a built-in lithium battery, so you don't need to replace the battery, just charge it directly. 3、The tuner is designed with a color screen, which can show the tuning status and beat more clearly. 4、The electronic tuner is detachable, connected to the clip through magnetic adsorption, and supports 360° rotation, which is easy to operate. 5、The tuner picks up the sound by vibration, and clamps it in a position where the vibration of the instrument is relatively obvious to quickly identify the pitch. 6、The tuning range of the electronic tuner is 27.5Hz (A0)-4186Hz (c8), with an accuracy of ±1 cent, fast and accurate. 1 x Tuner1 x Clip1 x USB Cable1 x Chinese and User English Manual Item Type: Universal TunerMaterial: ABSTuning Items: Guitar, bass, ukulele, violin, banjoPickup Mode: Vibration pickupTuning Range: 27.5Hz(A0)-4186Hz(c8)Tuning Accuracy: ±1 centA4 Benchmark: 430-450HzBattery Type: Rechargeable lithium battery (include)Battery Capacity: 120mAHCharging Voltage: 5VHow to Use: 1. Long press the power button to turn on/off; if there is no signal input or other operations for 3 minutes, it will enter the power saving mode or automatically shut down. 2. In the power-on state, lightly press the "Item" key to select the tuning item, and long press this key to quickly switch. In the guitar or bass state, lightly press the "Flat" key to set the number of pitches that will be lowered by a semitone. Tap the "◁" key and "▷" key to change the A4 benchmark, long press to switch quickly.