www.securitymagazine.com/articles/85794-provides-visually-intuitive-lock-down-tool

Provides Visually Intuitive Lock-Down Tool
BEST 40H Visual Indicator Thumb-Turn option from STANLEY Security
September 1, 2014
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This option from Stanley’s 40H mortise lock series is adapted to meet recent “lockdown” policy application demand from schools and universities, among other enterprise applications. The thumb-turn allows users to quickly and easily lock rooms from the interior of the door. The indicator uses simple, bold, color-coded “secured” (red) and “unsecured” (green) visual indication to ensure the door has been locked correctly and quickly.
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