The Raytheon ML903 mouse's wireless charging dock usually requires access to a computer's USB port. Once the base and mouse are paired, simply place the mouse on the base and the base will automatically charge the mouse.
specific steps are as follows
Place the Thor ML903 mouse on the wireless charging dock.
Connect the power adapter and plug it into the USB port on your computer.
Turn on the Bluetooth device on your computer and let the Raytheon ML903 mouse and charging dock automatically pair.
Once paired, the charging dock automatically charges the mouse.
If pairing isn't possible, try placing the mouse and charging dock close together, and make sure your computer's Bluetooth device is turned on.