If you like to keep things simple, the RF-100 may just be the perfect presentation controller for you. It's a:
Presentation remote with 2-way digital wireless communication
Long range: reliable operation at 100 feet (31 meters)
3 buttons: Forward, Back and Blackscreen
Wireless remote control of PowerPoint,® Keynote,™
SundayPlus,® EasyWorship™ and other presentation packages
Weighs only 1 lb (0.45 kg)
Low battery indicator
65,000+ digital addresses
1000 hours operation on two AA (UM-3) batteries
No software to install
Industry-standard USB receiver
One year warranty
30-day money back guarantee

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datasheet [pdf]

instructions [pdf]

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System Requirements


System Requirements	Windows (XP, Vista and 7), Macintosh (10.x) or Linux computer with available USB port.

Wireless Presentation Remote RF-100 Specifications


Dimensions	6" x 1.9" x 1.1"
Weight	.25 lbs (0.11 kg)
Range	100 feet (31 meters)
RF Link	Encrypted 2-way 916.5 MHz data link using 65,000+ digital addresses
Power	1000 hours of operation using two AA (UM-3) alkaline batteries
Color	Black

RF-019 Receiver Specifications


Dimensions	3.5" x 3.0" x 2.5" (8.9cm x 7.6cm x 6.4cm)
Weight	0.25 lbs (0.11 kg)
Interface	USB 1.0 using 6.6 foot (2 meter) cable
RF Link	Encrypted 2-way 916.5 MHz data link using dual antennas
Power	From computer's USB port
Color	Black