Smart cable with USB transmission,card reader,USB charging and LED Insert the TF card into card slot,then connect the computer interface so that read it and data could shuttle between computer and cellphone memory card.When you want to charge up your digital products like digital camera,cellphone,MP3,MP4,PDA etc.,you just need to let One end connect the computer USB port(or charger),the other side of one end connect the digital products in this jack.