1、DEVELOP CORRECT HAND SHAPE: The guitar trainer has a large horizontal press gesture standard, which can help beginners develop a correct hand shape. By using the exerciser, the fingertips are able to exert force vertically to develop the correct hand shape, which makes playing the guitar more accurate. 2、AUTHENTICITY: The exerciser adopts a 1:1 simulation of a real guitar fretboard design, which perfectly replicates the position of the guitar strings and realistically reproduces the angle of the keys. 3、DURABLE AND COMFORTABLE FEELING: The keys of the exerciser are made of silicone material with built in strong springs, which have good resilience and can be used for a long time without being easily damaged. 4、COUNTING FUNCTION AND ZEROING KEY: The exerciser is equipped with a counting function, which is convenient for you to keep track of the number of times you practiced, so as to improve the efficiency and targeting of your practice. At the same time, pressing the zero button on the counter can reset the counter to zero, making it easy to reset the number of times you have practiced. 5、REMOVABLE KEYS TO EXERCISE FINGER SPAN: The keys of the exerciser are removable, so you can choose different combinations of keys according to your needs. In this way, you can freely exercise your finger span, solve the finger stretching problem, and improve your finger flexibility and technique. 6、CONVENIENT STRING MAINTENANCE: The exerciser also comes with a string winder function for your daily string maintenance. You can use the white band winder on the trainer to easily tighten or untighten the strings to maintain the intonation and sound quality of your guitar, making string maintenance more convenient. Item Type: Guitar Chord Exerciser Material: ABS, Silicone Weight: Approx. 147g / 5.2oz Battery Capacity: 50mah Battery Type: One CR2032 Button Battery (Built In) 1 x Guitar Chord Exerciser