Handheld Transmitter, 3-3/4inWx3-3/4inH Price For: Each Item: Handheld Transmitter Includes: 9V Battery Height: 3.8" Features: Removable Wall Clip Depth: 0.9" Operating Frequency: 304.000 MHz Number of Buttons: 1 Powered By: 9V Battery Width: 3.8" Number of Channels: 1 Country of Origin (subject to change): China