The Liberty DUAL Deluxe Package (LDP-7500DUAL) includes the most popular, portable sound system on the market. Choose between the LIB-7500MU2 speaker with an MP3 player, or the LIB-7500CU2 speaker with a CD player, and you also get one LIB-7501 companion speaker. Either system comes with the companion speaker, two built-in 16 channel wireless receivers, your choices of two wireless mics, two speaker stands, a connection cable, and a mini cable to plug in external audio source. It has a built-in rechargeable battery that lasts 6-8 hours on a single charge. There is a charging LED bar indicator, and two universal microphone jack inputs on the back. It also has a "Voice Over" music ducking feature. Use it for schools, corporate events, sports, places of worship, and more!