Portable Super Bass Bluetooth Wireless Radio FM estero, With micro SD TF card slot, you can play mp3 format files in the TF card, Wireless portable mini Bluetooth stereo speaker system, Saves you from the hassle of tangled wires, Expanded BXS (Bass Xpansion System) drives a fuller, richer low-end response, Built in rechargeable battery , charged by computer via USB interface, IPHONE, , Samsung Galaxy/Note/tablet, Laptop, Tablet PC, etc, Working Range: Up to 10m/33 feet (open space,no block), Battery Charging Voltage:5V 0.5V, Radio FM estereo de gan calidad >Battery Capacity:520mAh, Battery Charge Time:2 hours, Loudspeaker Output:40mm 2.6ohm 3W, Input power: DC 5V, Frequency Response:60Hz-18KHz.