Product size: 56mmx34mmx113mm Weight: 173g Motor power: 21W Battery capacity: 3.6V 3100mAh Maximum charging power: 5V 2.1A Product name: Smart Winder Product model: ST1 Charging time: 3.5h Usage time: 5h for high-intensity use Standby time: 8-9h Screen: 12x29mm LCD screen Note:due to different production batches, the printed labels are different, which does not affect the use. Colour:Black Material:ABS Package Contents: 1 * Smart Automatic Guitar Tuner 1 * Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.

Product size: 56mmx34mmx113mmWeight: 173gMotor power: 21WBattery capacity: 3.6V 3100mAhMaximum charging power: 5V 2.1A