3 ms·

How does your safe help you if you are standing outside in the rain at midnight, after your generator/batteries have run down? (Perhaps you were on vacation whe

• sigkill 13y ago
  This mostly never happens. I've used fingerprint locks where the battery lasts easily for a year (that's with 5-6 accesses per day). Without getting into the discussion of the security factor of biometrics, the working mechanism of the lock itself is such that when it detects a success, a small servo engages some sort of a gear which enables you to complete the mechanical circuit (so to say) when you push the door lever down and move the physical lock with human effort. This means that the battery is never constantly used, only when the actual sensor is active. Even if it were dead, there exists a manual key override. Also, (I've tested this personally), the factor of safety is quite good in that, the lock starts beeping "LOW BAT" a good 3-4 weeks before the battery is completely drained. Also, (Another one) it doesn't leak information about low battery until there's a successful entry, so an evil attacker can sit near your house activating the sensor all day and he won't know his progress in draining the locks' battery.
• hrktb 13y ago
  On the models I have seen you can replace the battery from the outside Edit: it seems electronic locks that come on top of the existing lock tend to have the battery pack inside, while electronic only locks can have it outside. BTW the batteries are supposed to last two years in the product description (that's in line with what I had too) I was mentionning these kind of locks: http://www.kk-alpha.com/housing/ns100/images/product_01.jpg http://www.kk-alpha.com/housing/ns100/images/product_01.jpg