Why is this important? Because other presenters on the market can discharge the battery if the buttons are accidentally pushed. Imagine if you left this in your briefcase and the buttons were being pushed - only to find when you needed to use it your were out of juice.

The on/off switch protects against accidental battery discharge.

The WP05 uses Radio Frequency to transmit the commands back to the receiver on your computer.

Most wireless presenters on the market us IR (infrared technology) to transmit signals. This means you always need a clear line of sight to the receiver. Each time you need to move a slide you then need to aim and point the remote toward the receiver.

With the WP05, radio waves can pass through objects - meaning you don't need to worry about being in the line of sight. In fact you can be up to 45 feet away and control a slide show.

The WP05 receiver can also double as USB drive. When in USB drive mode, the drive can function at blazing fast USB 2.0 speeds.

When used as a receiver the switch must be moved to the USB 1.1 for maximum range and functionality.

Most wireless presenters on the market that have the USB drive only function at the slower USB 1.1 standards. The WP05 offers the best of both worlds - MAXIMUM SPEED and FUNCTIONALITY.