The infrared field created by the Wireless Sensor Bar allows for play up to 25 feetaway 
perfect for larger or wall-mounted TVs. The Wireless Sensor Bar is easy to set up, 
requiring no software or hardware installation on the Wii. Featuring 30 hours of battery
life off 4 A A batteries (included) and a unique power saver mode with audible alarm, 
the Wireless Sensor Bar is designed for ultimate convenience. Ideal for wall-mounted 
flat screens Powered by 4 A A batteries (included)