KNG Andrew. System type: single speaker, Recommended usage: PC, Speaker placement: Portable. RMS rated power: 4 W, Peak Music Power Output (PMPO): 40 W, Frequency range: 180 - 20000 Hz. Connectivity technology: Wired, Speaker interface type: 3.5 mm. Battery voltage: 3.7 V, Battery recharge time: 3 h. Cables included: Audio (3.5mm), USB