The LOWE & FLETCHER 3780 Digital Combination Lock is an easy to use and versatile digital code lock system, providing convenient access with no need for keys. It features a mechanical override lock, audible keypad and auto lock and unlock modes. The lock has the option for a 4-digit user code, 6-digit sub-master code and 8-digit master code. It is suitable for vertical fixing with reversible handing, and is ideal for a range of applications such as lockers, office furniture and postal. It comes complete with 2 x AA batteries, and each pair of batteries can power the lock for up to 50,000 cycles.