Alecto BSP-40. Recommended usage: universal, Speaker placement: Tabletop/bookshelf. RMS rated power: 4 W, Frequency range: 20 - 20000 Hz. Connectivity technology: Wireless, Wireless technology: Bluetooth, Connector(s): microUSB. Width: 150 mm, Depth: 60 mm, Height: 40 mm. Subwoofer: passive, Bluetooth profiles: A2DP