Spectrum Mini Plug N Play Amp With Overdrive. This is a handy little amp that doesn't require a cable, just plug and play. It also has a headphone jack to plug in and practice without bothering anyone.   

Spectrum Plug and Play Mini Amp Features:

• Compact Cool Classic Guitar Shape • Plugs Into Guitar With Universal Positioning 1/4 Plug • Volume, Distortion & Overdrive Controls • Can Be Clipped on Guitar strap or Worn on Belt

• MP3 Input for Play-A-Long to Music • Can Be Used as MP3 Player Amplified Speaker • Headphone Jack For Playing in Private