Two power supply One is USB power supply and other is battery supply Can listen to music anywhere anytime Perfect sound Can open ball and then it will be apart to 2 split speakers Don't use it or take it out and can put 2 half together Convenient to carry Looks very cool Can print logo on speaker and packing box Suitable for both promotional and retail field USB power supply: Connect attached USB cable to computer Turn power switch to on position Power indication lamp lights up Device goes into running state USB power supply is automatically cut off in order to avoid unnecessary consumption of batteries Battery power supply Open cover of battery box and insert three number 7 batteries according to their pole indication Stop using, power switch must be turned to off, to avoid the unnecessary consumption of batteries Available in various colors Applicable scope: computer, some part of mobile phone and any device with 3.5m audio frequency plug