It has an optional alarm for incorrect codes too. (iphonehacks.com)
«The ATT is also concerned that the proposal is wholly out of line with work that is being done elsewhere to address the problem of tax underpayments that are caused by incorrect coding. (politics.co.uk)
Security features: ANSI / BHMA Grade 2 Certified, SecureScreen, optional auto - lock, optional alarm for incorrect codes, and more (amazon.com)