The ZQS 8211 Dual 8 Inch New Design Portable Speaker is a powerful subwoofer DJ speaker that is perfect for outdoor use. With its battery-powered feature, you can take this speaker anywhere you go. It is not waterproof, so make sure to keep it away from water. This speaker is designed specifically for outdoor use and is a passive speaker type. It can be used for home theatre, portable audio players, mobile phones, karaoke players, and computers. Enjoy high-quality sound and bring the party wherever you are with the ZQS 8211 Dual 8 Inch New Design Portable Speaker.