Dell MS900 Premier Wireless Mouse - Manual (Page 18)

Pairing your wireless mouse │ 18
Switching between paired devices
Your wireless mouse memorizes the last connection mode. Every time you turn on the
mouse, the last connection-mode light along with the low battery LED indicator will turn
on for 3 seconds.
If you want to connect to another paired device, toggle the connection-mode button
until the respective connection-mode light turns on.
For example, if you want to connect to the wireless mouse using the Dell Secure Link
USB receiver then press the connection-mode button until the connection-mode light
( ) is selected.