portable mini speaker False color screen: 28*28mm Full-format audio decoder Support U disk, SD card, Mini SD, TF card, USB Portable mini ... =1KHz)Sensitivity: 470MVAmplifie S/N ratio: ≥85dBALine-in resistance : 10KΩSpeaker: 1.5”(OD 42mm),magnetless,4ΩInput volatage: DC 5V ... -108.0 Size:85+85+89mmBox size:90+90+104mm portable mini speaker