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
liftmaster_373lm_om.pdf

(0.16 MB in English) This requires Acrobat 10 or higher