... , stage, etc. PA Speaker, 6.5''8'' 10" 12'' woofer Power/RMS:50W x 2CH 8ohmFrequency Response:30HZ-20KHZFunctions:USB/MMC ... ,Color,FM radio,ColorOptional woofersize:6.5",8",10" 1. Power (RMS): 50W*22. Impedance: 4Ω3. Speaker units:6.5 ... optional9. iron net cover to protect the speaker Professional Stage /hotel meeting room,hotel Speaker with USB/SD/FM