Feature: 100% brand new and high quality. Auxiliary back with silicone anti-slip textures, increase friction from the hand of the hand, the practice is not easy to slip. Small and lightweight, no need to carry the guitar can also be picked up at any time and can practice. With error correction detection lamp to prevent wrong training; When the shape and strength of the hand are standard, the detection light will turn green, otherwise not, effectively prevent the wrong shape of the hand.1:1 simulation of real guitar fingerboard, support keys to prevent folding fingers, stable hand shape, adults and children can be usedIt is also an extended finger training device, many experienced teachers will allow students on the neck to practice finger splitting. Specification:Name: FM Chord TrainerMaterial: ABSColor: Black, Blue, Pink Size: 180x46x4 2mm/7.09*1.81*1.65inWeight: About 88g Package List:1 x F1 x Guitar Chord Trainer Battery1 x User ManualNote:Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Please allow 1-2cm measurement deviation due to manual measurement.