The Liberty DUAL Basic Package AC Only includes the most popular, portable sound system on the market. The LIB-8000CU2AC speaker with a CD/MP3 Combo Player. Package also comes with two built-in 16 channel wireless receivers, your choices of two wireless mics, bluetooth option, a speaker stand, and a mini cable to plug in an external audio source. It is AC powered only, which means it must be plugged into a power source to run. Also, there are two universal microphone jack inputs on the back. Use it for schools, corporate events, sports, places of worship, and more!