Transceiver with 1 GB Flash Memory
The transceiver is also a fully functional flash drive, so you can store and transfer files and free up USB ports.

2.4 GHz Wireless Technology
The 2.4 GHz wireless USB mini-transceiver connects wirelessly right out of the box with virtually no interference, and up to 30 feet of wireless range.

USB Rechargeable with Magnetic Connectors
Simply snap in the magnetic connectors to charge while working, using the included USB transceiver.

High Definition Laser Technology
Microsoft High Definition Laser Mouse products are more precise, more responsive, and deliver smoother tracking.

Battery Life Indicator
You won't get caught with a dead battery—the Battery Status LED Indicator glows red when the battery is running low.

Microsoft new mouse with storage ( 1Gb). Look for it in October, for $49.