Linear D-22A 1-Channel, 1-Button Handheld Transmitter

The Linear D-22A is a compact 1-channel, 1-button handheld digital RF transmitter designed for security systems, panic-button applications, and remote switching. It operates at 303.875 MHz and uses Linear's standard digital format with 256 selectable codes, allowing the transmitter to be matched with compatible receivers. A single pushbutton activates transmission, while the front red LED indicates transmission and battery status. The unit uses one 9-volt battery and includes a removable wall mounting clip. Its compact housing measures approximately 2.16 inches wide, 3.75 inches high, and 0.88 inches deep, making it suitable for portable or wall-mounted use.