Products Description MT-508Maximum Output Power: 180W (4Ω Load)Total Harmonic Distortion: <0.5%Frequency Response: 35Hz-18kHzDriver Configuration:8" Woofer: 100mm Magnet, 25mm Voice CoilHorn Tweeter: 80mm Magnet, 25mm Voice CoilPower Supply: AC 220V/50HzBuilt-in Battery: 12V/7.2Ah (Single Battery)Wireless Receiver Module: UHF BandOptional Accessories: 2 handheld/lavalier/headworn microphones