Marmitek BoomBoom 150. System type: single speaker, Recommended usage: universal, Speaker placement: Portable, Tabletop/bookshelf. RMS rated power: 3 W, Frequency range: 20 - 20000 Hz, Impedance: 4 Ом. Connectivity technology: Wireless, Speaker interface type: 3.5 mm, Wireless technology: Bluetooth. Width: 80 mm, Depth: 80 mm, Height: 74 mm. Battery technology: Lithium-Ion (Li-Ion), Battery voltage: 3.7 V, Battery life (max): 8 h