*Speaker function parameters -output power: RMS 3W THD = 10% -frequency response: 150-1800Hz -FM frequency range: 87.05-108Mhz -SNR: >90DB -speaker: 1.58 inches (external diameter 40mm), ohm*2 -storage/download: USB date cable,direct download, no external card reader -bluetooth conection distance: 25M, with the hands-free function -power input: USB power adapter wiring or 5V/1000mA of the AC power adapter