Features: Built-in with a 3.7V 1200mAh lithium battery. Folding stand is easy to use, no assembly required. A-frame shaped is more stable for holding the guitar. Comes with a TF card with 128MB capacity. Supported with WMA, WAV, and MP3 audio formats. Universal guitar stand, suitable for acoustic and electric guitars. The Benefits of Guitar Open Sound: 1. The sound quality of the guitar can be greatly improved. The high and low bass are integrated with each other, which is more coordinated. 2. The sustain of the guitar will be longer, and the transition of the sound will be more coherent! 3. After sound open, the tone of the guitar will be more transparent and powerful. 4. The volume of the guitar will also increase significantly. Specifications: Material: ABS+aluminum alloy+silicone Battery: 3.7V 1200mAh 103040 lithium battery TF Card Capacity: 128MB Audio Format Supported: WMA, WAV, MP3 BT Version: BT5.0 BT Name: SGS-10 Transmission Distance: 10M Use Duration: About 4 hours Unfolded Size: 312 * 276 * 222mm / 12.28 * 10.87 * 8.74in Folding Size: 312 * 135 * 57mm / 12.28 * 5.31 * 2.24in Item Weight: 594g / 1.31lb Package Weight: 738g / 1.63lb Package Size: 33.3 * 15.5 * 7.5cm / 13.11 * 6.10 * 2.95in Package List: 1 * Stand 1 * Type-C Cable 1 * Manual (English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin