Check the listing for details. Linear MCT-3 DNT00089 MegaCode 3-Channel Remote Transmitter - 2Pk LD033 LD050. Condition: New. Listed at 56.48 USD. Mega Code / Linear MCT-3 (DNT00089) 3-Channel Remote Transmitter Gate Operators - 2 Pack Mega Code / Linear MCT-3 (DNT00089) 3-Channel Remote Transmitter Gate Operators - 2 Pack The MCT-3 MegaCode® digital transmitter is a wireless radio control designed for use with automatic garage and gate operators. Each of the three transmitter buttons will send a unique code when pressed. One button can be used to activate the individual’s garage door opener, a second button can operate an access gate, a third button can activate an additional garage door operator or most Linear 318 MHz MegaCode® wireless receivers. MegaCode® transmitters and receivers do not contain a typical “coding switch”. Each transmitter is permanently coded at the factory. The receiver is programmed by “learning” a transmitter’s unique digital code. The receiver will activate only from the “memorized” transmitters. The transmitter is powered by two Type 2032 “coin-cell” batteries. They should last 3 years with normal use. The red indicator on the face of the transmitter will glow when the unit is activated. If the indicator lights dimly, or not at all when transmitting, the batteries need to be replaced. To conserve battery life, an internal timer limits the transmission duration to 10 seconds if a transmitter button is held down. Payments & Returns Policy