... .21 feet)Max S/N Ratio39dB Electronic ShutterRolling ShutterInterfacesOptical lensInterfacesCS Mount (Interchangeable Lens)LensFixed Iris, Manual FocusFocal LengthFixed Focal, f4 mm ... , Android, Blackberry MobileGeneral ParametersEnvironmental Casing Metal Housing, Outdoor UseInstallationCeiling Mount Screws Included, Wall Mount Brackets OptionalOperating Temperature -20 °C ~ 50 °C (-4 ...