1) Active speaker system, with Kara OK function, no external power amplifier 2) Such as audio connection with PC / VCD / DVD / MP3 / TUNE 3) Intuitive control platform, easy to use 4) Built-in power amplifier, with the multi-speaker unit, saw strong performance in any environment 5) Simple elegant shape, noble and elegant temperament 6) Speaker power: 30W 7) Speaker impedance: 4 ohm 8) THD: 0.1% 9) SNR: 76db 10) Frequency response: 20Hz ~ 20KHz 11) Input voltage: AC 220V, Rechargeable 12) Wireless microphone battery: 2 x AA batteries (Not included) 13) Wireless distance: 10m 14) Support SD / MMC Card / USB Flash Disk 15) Support 2CH Wired Microphone Input 16) The signal level: 200mV 47K 17) Active speaker size: 322mm (L) x 245mm (W) x 158mm (H) 18) Active speaker weight: 5.2kg