Enjoy! #FF-This hashtag mostly shows up on Fridays, which should give you a good indication of what one of the Fs means. The other stands for Follow, and the two combine to make the phrase Follow Friday.. Follow Friday is essentially a Twitter holiday with the aim of getting people to follow one another.
Technical. Original manufacturers part,390 Mhz frequency, 9-volt battery operated, part number 976LM a 977LM keypad is substituted per the manufacturers change, Color: Grey Works with all Liftmaster, Sears and Chamberlain garage door openers, utilizing the 390 Mhz frequency.echnical. Original manufacturers part,390 Mhz frequency, 9-volt battery operated, part number 976LM a 977LM keypad is substituted per the manufacturers change, Color: Grey Works with all Liftmaster, Sears and Chamberlain garage door openers, utilizing the 390 Mhz frequency.
5.8GHz Cordless Phone Frequencies. Fourth generation 5.8GHz cordless phones have been allocated the frequencies between 5.725Ghz and 5.850Ghz. It is important to note that some 5.8GHz cordless phones use the 5.8Ghz frequencies only for base-to-handset transmissions, while still using the 2.4Ghz frequencies for handset to base transmissions.