Soundcast OutCast - Portable Wireless Indoor / Outdoor Weather Resistant Speaker Control your music without touching your device with OutCast's builtin backlit controls and set the mood for your music at night with a blue ambient light 8 downwardfiring, highSPL, longthrow woofer using IMPP cone and rubber surround Four fullrange drivers in a stereo 360 array using IMPP cones and rubber surrounds FHSS 40Ch wireless protocol, redundant error correction, robust packet loss detection, auto muting Battery: Rechargeable internal battery with internal AC power supply and builtin charger