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There are two modes of operation available:
An integral infra-red sensor in the unit allows the unit to be programmed using the optional DD-LCDHS programming handset. This gives complete flexibility over many of the operating parameters. Without the handset, manual adjustments can be made to the sensitivity, lux and time settings using controls accessible behind the lens. The UHS user handset can be used to change output lux levels and override the lights on or off.