Simply communicate! Users play back the pre-recorded single message (up to 20 seconds) with the slightest touch of the large, easy-to-target, 5 1/4"-dia. activation surface. Big Talk can also be used as an external switch to activate an adapted toy or device. Requires four "AA" batteries. SIZE: 7" x 4 1/2". SPECIFY: Red, Blue, Yellow, Green or Purple.