Looking for a wireless mouse for laptop

Need to keep bag as light as possible for traveling (planes, etc.)

Gaming play is limited to Sims/City and Age of Empire type games. (imediate mouse response not as critical.) Mostly work application/cad work.

Wireless or bluetooth (laptop may not have an antenae built in)

Looked at mice at the store, but not enough information shown on the packaging to figure out what is required for operation. I think some only need a usb stick like antenae for rfid.

Most it seems required to have an external mast to work. (might as well use my corded optical then)

any thoughts?