Features:

• Compact wireless presenter with an ergonomic design and easy fingertip control, and a bright, easy-to-see laser pointer
• 2.4GHz wireless technology delivers interference-free control of your pointer from up to 60 feet away
• Wireless USB receiver fits inside controller's storage space so it never gets lost
• Comes with Kensington's one-year warranty
• Runs on two AAA batteries, and measures 1.75 x 0.75 x 4 inches

Editor Reviews:

Product Description:
The 2.4GHz of wireless technology let's you concentrate on your presentation and forget about wires and cords. The palm-sized design features a convenient, one-touch start button. Ergonomic design fits comfortably into the palm of your hand Plug and play simplicity requires no set up 2 AAA batteries provide long, reliable usage (included) Rubberized texture offers comfortable, secure grip

Amazon.com Product Description:
The Kensington Wireless Presenter with Laser Pointer lets you remain in control of your presentation from anywhere in the room. Conveniently portable and easy-to-use, this wireless presenter frees you from distraction and allows you to focus on what matters most -- your presentation.

The Kensington Wireless Presenter with Laser Pointer features 2.4GHz wireless technology that delivers interference-free control of your pointer from up to 60 feet away, and a bright laser beam that ensures easy-to-see pointer visibility. This unit has a compact design with a hidden dongle as an on/off switch, a handy storage space inside the palm-sized controller for the wireless USB receiver so it never gets lost, and an ergonomic shape with a textured-rubber grip that fits comfortably in your hand for hours on end. This Kensington presenter also features fingertip control for easy use, and offers the simplicity and convenience of plug-and-play performance. This wireless presenter runs on two AAA batteries with long, reliable usage time, measures 1.75 x 0.75 x 4 inches (WxDxL), and comes with Kensington's one-year warranty.

Rating : - Great device
The Kensington 33374 is a great device for presentations. With this model the company has addressed my three issues with the prior version
1) Now the device is OFF when the USB antenna is in its home spot on the device. This prevents inadvertent depressing of the laser pointer (and therefore drainage of your battery) when the device is being carried. I kept my old one is a rigid plastic container buffered by paper towels to prevent this from happening.
2) The device now uses AAA batteries, While the AAAs are larger than the prior watch battery, the device still fits snuggly in your hand and, with lithium batteries, is only minimally heavier. AAAs are readily available, as opposed to the watch battery.
3) You can now open the battery compartment without a tool. You used to have to have one of those tiny eyeglass screwdrivers to open the case, who wants to worry about having to carry one of those around? I always carried a replacement battery (see #2), but during my last presentation to the FDA in Rockville MD, the device died and I could not replace the battery as no one had one of those screwdrivers.
I really like this slide changer as it is very simple with no extra bells and whistles to distract you from your goal, to give a killer presentation. And when you pass it around to other presenters they grasp how to work it instantly.