Turnstiles are effective for controlling access into a secure facility because they only allow one person at a time to pass through and only on the presentation of identification, use of a token, or remote controller to allow access. Turnstiles have a metal bar which locks into position; access is thus prevented until authorization is given and the metal bar is released. At this point, a single person is able to go through before the bar locks back into place immediately. Turnstile greatly increases safety and it has become an enhancement for the School Angel product. The turnstile is optional to the school Angel service but we will be delighted to offer a quotation if you do require one as usually recommended by us to all School Angel user schools.