Feature: 1. Portable and light-weight, easy to use and carry. 2. 6.35mm plug, just plug into guitar jack, no need of installation. 3. 3 adjuster: gain, tone, vol. 4. \"Phones\" jack to connect headphones, portable speaker, mixer, or recorder. 5. AUX jack lets you connect an external audio device 6. Walmeck guitar amplifier ultra mini size, easy to use and carry. 7. Can plug with earphone enjoy the classical sound of guitar. 8. With cable jack contact with external devices, fits all you needs. 9. Clear and bright audio stereo output. 10. suit for most kinds of string instruments. 11. 6.35mm plug, just plug into guitar jack and enjoy the metal sound, no need of installation. 12. Phones jack to connect headphones, portable speaker, mixer, or recorder.AUX jack lets you connect an external audio device 13. Comes with a USB cable for charging. 14. Portable and light-weight, easy to use and carry. Plug it in your guitar and enjoy the metal sound. 15. 6.35mm plug, just plug into guitar jack, no need of installation. Phones jack to connect headphones, portable speaker, mixer, or recorder. Specification: Features: Portable and light-weight, easy to use and carry. Plug it in your guitar and enjoy the metal sound. 6.35mm plug, just plug into guitar jack, no need of installation. "Phones" jack to connect headphones, portable speaker, mixer, or recorder. AUX jack lets you connect an external audio device such as cellphone or MP3 player. 3 adjuster: gain, tone, vol. Comes with a USB cable for charging. Specifications: Color: Black Material: ABS Power Supply: Built-in rechargeable battery Working Current: 37mA Item Size: Approx. 7.5 * 7.5 * 1.2cm / 3 * 3 * 0.5in Item Weight: Approx. 33g / 1.2oz Package Size: 14 * 11 * 2cm / 5.5 * 4.3 * 0.8in Package Weight: 70g / 2.5oz Package List: 1 * Guitar Plug Headphone Amp 1 * USB Cable Package List: 1 * Guitar Plug Headphone Amp 1 * USB Cable