Wireless Sensor Bar gives you better Wii Remote functionality without the hassle or mess of any wired connection to the console. 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 AA 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 AA batteries (included)