The Model 308913 1-Channel Visor Transmitter is a poratble transmitter designed for automatic door and gate operator applications. This transmitter is a single-channel device, pressing the pushbutton will send a signal to the receiver. The transmitter has a red test/operate indicator and is powered by a 9V battery. A visor clip is included. The transmitter is Multi-Code format with one 10-position coding switch providing 1,024 possible codes. The transmitter will only activate receivers set with the same code. The Model 308913 1-Channel Visor Transmitter is compatible with 310MHz Stanley receivers and Model 109950, 302850, and 309013 receivers. with 310 MHz Stanley receivers and Model 109950, 302850, and 309013 receivers.