LIFTMASTER model 373LM transmitter. It transmits using on frequency 315 MHz, Security plus (315 MHz). It has 3 button(s).
The warranty on the 373LM garage door transmitter is 1 year from LIFTMASTER.
The model 373LM is still available.
LIFTMASTER model transmitter instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
(0.16 MB in English) This requires Acrobat 10 or higher