FEATURES : Wireless Connectivity Support USB/TF card Rechargeable Battery Wireless Stereo Twin Speaker Function When you have two devices Need to long press "M" to build The connection Both Fm Radio, Search and Record The FM Frequency Automatically SPECIFICATION : Wireless Transmission rang-up to 10meter Speaker Drive Size : 12 inches Out put power : 2000w frequency Response : 100hZ -20khz Signal to noise ratio : 85dB FM Scan rang: 87.5-108.0MHz Battery Capacity : 3000mAh Max Memory Support (USB/SD) :32GB Playtime : up tp 3 hours at 75% Volume Charging Time : 2-3hours