Taken from http://www.tech-faq.com/wireless-mouse.shtmlPairing
Pairing is the process of coordinating your mouse's transmitter with your mouse's receiver. It requires both parts to operate on the same frequencies, usually by using the same identification code. Pairing takes place to try to eliminate interference. Some devices automatically pair both devices at start up; others need to be manually paired.
thanks!
p.s. how do i repair the set (im not good with mouses and keyboards stuff^^)
In that case you can give bluetooth devices a four digit key. Can I ask you what Operating system you are running?he has a usb bluetooth reciever sorry forgot to mention that