bought as a substitute for age-old Simba DA5100 - trying to manual programming - frustration, is not working. it was also accidentally 4 instead of 2-channel transmitter sent - but I remembered Amazon review before buying - and with the guidance of ruebe for two channel transmitter skin it out:; keywords = RepData% 20433 & qid = 1371491772 & sr = 8-3 # R3014KNQTHVQ1L. 2115.Helpful.Reviews stations so strong gate opens even when you press the transmitter inside the house ... am excited and my wife too! :-)