Toysmith Rock On! Retro Amp MP3 Mini Speaker Styled after a retro guitar amp, this versatile mini speaker contains high quality electronic components so your tunes come through crystal clear. Perfect for your desktop, shelf, or countertop, you can enjoy your music solo, or rock a party. Three controls above the speaker adjust volume, bass, and treble for a custom sound. Connect your smartphone, MP3 player, or desktop or laptop computer with the included 3.5mm audio cable and play your entire digital library. The speaker is powered by 3 AA batteries (not included), or using a USB cable (included). Recommended for ages 8 and up. Challenge your children's imaginations and keep them active with Toysmith. Committed to providing the most imaginative toys along with the highest safety standards, Toysmith has toys appropriate for all age groups. Toysmith offers toys for any kind of play: active play, science and discovery, arts and crafts, impulse and novelty toys, and nostalgic retro classics.