... Built-in recharge battery 3.High sensitive wireless microphone Portable speaker PK-15MBuilt-in DVD player,can play DVD ,DVCD, ... ,lavalier ,and clip type optional )2-3 wired microphone inputs jack for connecting and switching to extemal speaker built-in audio source9 ... 250WFrequency response35HZ-20KHZSensitivity 94dB(1W/M)T.H.D<1%speaker unit15 inch woofer,horn tweetervoltage:AC110-240V/50/60HZbuit-in ...