Original: An undercover police officer will wear a headband , wrist band or other conspicuous clothing in the '' color of the day '' ; which is relayed to officers at the station house or could formerly be heard on very early morning radio in New York on station WBLS .
Simplified: An undercover police officer will wear a headband , wristband or other piece of clothing in the same color as the '' color of the day '' ; this color is told to officers at the station house before they start work .