Powering twin tweeters & a subwoofer with 30 watts, this Neostar-Electronics Bluetooth speaker system streams music wirelessly from any Bluetooth powered device. The speakers also feature an aux-in socket for wired devices, a digital FM tuner with LED display & SD & USB (Universal Serial Bus) ports.30W speakers with Bluetooth receiver for wireless connection Twin tweeters & 4 subwoofer to drive bass Digital FM tuner with LED display Twin SD card & USB (Universal Serial Bus) ports Lithium-ion rechargeable battery with up to 4-hour charge use Unit measures 490mm H x 156mm D x 140mm W Aux-in for wired devices