SHIDU S512 portable voice amplifier has wireless connectivity, easy to carry amplifier, intelligent digital power amplifying mode enables low consumption of power and normal model consumes at most 18W, supports TF card and USB flash drive that can directly play MP3 / WMA / WAV audio and works as a speaker for computers or mobile phone, mini karaoke system option, built-in 1000mAh rechargeable lithium battery, amplification use time 8-12 hours, charging time need 3-5 hours .