LIFTMASTER model 971LM transmitter. It transmits using on frequency 390 MHz, Security plus (390 Mhz). It has 1 button(s).
The warranty on the 971LM garage door transmitter is 1 year from LIFTMASTER.
The model 971LM is still available.
LIFTMASTER model transmitter instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
(0.31 MB in English) This requires Acrobat 10 or higher