This trolley speaker comes with two wireless handheld Microphones that can reach up to 100 meter. It can play music with USB, Bluetooth or with memory card. It has Bass, Treble, Echo, Mic volume controls and Battery indicator. It can also be use to play keyboard and guitar. It has Bluetooth and Radio which will be selected from MODE Button at th back of the speaker. You can push it on the floor like travelling bag. You will get more details about this speaker inside the manual. The rechargeable public address system has an built-in Amplifier and rechargeable battery, It has USB and SD mouth, two (2) wireless Microphones and remote control. The size is 12 inches. It has movable tyres and trolley hand for pushing. It is a wireless speaker with BLUETOOTH & FM RADIO. It plays music using USB, SD/memory card or Bluetooth, select Bluetooth mode from the system and search with mobile phone or any other device to connect and play any selected option. It is very loud and clear. The microphoneswireless distance is 100M range. It is good for Church, Mosque, evangelism, School, Studio, Hall, Seminar, Sports centre and for any open or indoor events. Ideal for preaching, teaching, advertisement etc. It can also be used to play Guitar and Keyboard. Recharge for 4 hours and it will last upto 6-8 hours. It has Battery indicator which indicates when the battery is low or fully charged. It comes with the power adaptor for recharging. It is a system you will enjoy very much.