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.
However, there are a few warnings of which to take heed. In the past there were three microchip frequencies commonly used in the U.S. that responded to scanners on the fame frequency. These were 125 kilohertz (kHz), 128 kHz, and 134.2 kHz. Until recently, these frequencies were mutually exclusive. For example a microchip that responds to a 125 kHz scanner would not respond to a 134.2 kHz scanner. There were some very sad cases of dogs unable to be returned to their owners, despite having a microchip, because it did not respond to the scannerâs frequency.