COWIN Sound System A Portable Bluetooth Speaker and a Detachable Subwoofer Bass Station with Build-in Wireless Charging Dock Revolutionary design: Ark is a sound system that combines a detachable mini sound bar (cruse) and a powerful subwoofer bass station Multi connectivity technology: Ark work with the following connectivity technology: NFC, Bluetooth (A2DP), UHF and 3.5mm aux Build-in wireless charging dock with magnate technology, moving the speaker close to the bass station Regular portable speakers have average sound power, but poor bass and regular home speaker systems have good sound power, but are not portable