["Description: Grandstream F-MM850-550M-1.25G Multimode", "SFP fiber optic module that allows you to set up an enterprise class LAN or generally use as an optical connection in an ultra-fast network. The fiber optic transceiver module has a maximum transmission distance of 550 meters and supports transmissions with a nominal wavelength of 850 nm. F-MM850-550M-1.25G is an SFP", "Module with a fast data rate of 1.25 Gbit/s"]