Citiger(TM) 2.4G Wireless Privacy Security Mouse, Office Computer Mice, with Hidden Key, Lock Screen Key, Come with Nano Receiver (Black) This wireless mouse is the first mouse to protect the safety of privacy. Two security keys, jointly protect personal privacy. Powered by one AA battery (not included). 2.4G wireless technology, working distance to 10m, good for long distance operating. Can work on any surface without mouse pad, such as couch, table, even you pants. This is the necessary product of social development, wired mouse to wireless mouse, wireless mouse to protect privacy wireless mouse.