LIFTMASTER model 974LM transmitter. It transmits using on frequency 390 MHz, Security plus (390 Mhz). It has 1 button(s).
The warranty on the 974LM garage door transmitter is 1 year from LIFTMASTER.
The model 974LM is discontinued.
LIFTMASTER model transmitter instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_974lm_om.pdf
(0.10 MB in English) This requires Acrobat 10 or higher