The Calyx Lock is an electronic key-combination lock for security cabinets, filing cabinets, gym lockers, and gun lockers. It uses an existing lock 'tumbler', and wraps an entire electronic security system around it. Enter your code, push enter, and turn the knob.

A patented mechanical locking system was developed to allow manual key use as well as electronic use of the device.

The electronic features of the lock include 3-color LEDs, a rechargeable LiPo battery, a reprogrammable 100-user database, and micro USB access to a fully timestamped audit trail of keystrokes and user accesses.