Product Introduction: Audio head: 6.35mm audio plug, which can be rotated 282 degrees and connected to guitar or other instruments Battery light: Display current battery level Volume button: Single click volume +, double click volume Power switch: Turn device on or off Charging indicator: The indicator light is on when charging; the indicator light is off when charging is finished; the indicator light flashes when battery is low. Type-C interface: used for Type-C USB charging and connecting to smartphones, computers, etc. for recording. Headphone port: 3.5mm headphone port Instructions for use 1. Connect 6.35mm audio head to guitar, the headphones to headphone port, and then turn on product. 2. Put on headphones, then play guitar to hear sound 21 Thank you for choosing our products. This is a headphone guitar amplifier specially designed for instrument practice. It has high-definition sound quality, low latency, and long battery life, and is suitable for most electro-acoustic instruments. I hope it add convenience and fun to your performance practice! Color: Black Material: ABS Package Contents: 1 x Headphones Guitar Amplifier Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.