VEN12 -LN -MT1B ACP00877 LINEAR ACP00877 1 CHNL BLOCK CDED HANDHELD TX 10 PER PACK The Model MT-1B 1-Channel Block Coded Visor Transmitter is designed for use with Linear's access control products. The Model MT-1B is a single-channel device. Pressing the button on the transmitter will send a signal. A visor clip is included. The transmitter is MegaCode format, which means each transmitter is factory preprogrammed with one of over 1,000,000 codes, virtually eliminating the possibility of code duplication.