Newest patent products,with a lower current from computer,the slippers can warm and massage your hand with good temperarue,safe! Features:1) Warmer function:a) Special USB line for warmer function and ensuring the safety of productb) Stable temperature about 40 degrees centigrade for warming the handc) Infrared massaging and sterilization2) 4 port USB hub:a) fully compliant with the universal ...