Mutant MIG-PS1-5 Media Yo Yo Amplified Speaker - PinkMutant MIG-PS1-5 Media YoYo speaker in white is the best companion with any portable audio player, as well as laptop computers. This portable speaker is so easy to keep at your side for playing music anywhere anytime. It expands out to enhance the bass output. Built in rechargeable battery. Portable pocket speaker with compact size for easy portability, expandable diaphragm enhances bass sounds, retractable 3.5 audio jack, compatible with most. mp3 players, glow LED indicator ring adds night time ambiance, built in rechargeable lithium ion battery.