The Model 109710 4-Channel Visor Transmitter is a portable transmitter designed for automatic door and gate operator applications. This transmitter is a four-channel device. Each button activates one of the four channels. The buttons feature raised dimples for easy, or vision-impaired identification. A visor clip is included. The transmitter is powered by a 9-volt battery and has a test/operate indicator. The transmitter is Multi-Code format with two 10-position coding switches providing 512 possible codes for each channel. The transmitter will only activate receivers set with the same code.The Model 109710 is compatible with 310 MHz Stanley receivers and Model 109950, 302850, and 309013 receivers.