Wireless Transmission rang: Up to 10meters Speaker drive size: 6.5 inchx2 Output power: 20w+10w tweeter Frequency response: 100Hz-20KHz Signal to noise Ratio: >=85dB Battery Capacity: 2400mAh Max memory support (USB/SD CARD): 32GB Charging Time: 3-4hours FM scan rang: 87.5-108.0MHz USB Charging: DC5V Play time : up to 1-2 hours at 75% volume