cordless

 operating without a wire connection to the companion communicating unit; -- of telephones and other devices using e.g. radio or infrared signals to allow communication between devices without a direct wire link; as, cordless telephones have a very restricted range compared with cellular phones.  [PJC]

 using a battery as a source of power; -- of tools which usually use line current for power; as, cordless electric drills are very convenient for use outdoors; cordless razors make shaving while travelling easy.  [PJC]