O-ring tightening between battery part and electronics part:
protects the circuit should the battery leak!

Nickel plated High force double contact springs:
safe double contacting, ensures no power lose due to loose contacts!

Timer with well detent rotary switch with gold contacts.

Multilayer Printed Circuit Board
Electronic parts automatically inserted on both sides:
Provides highly reliable electronics with smallest possible area!

Large push button switch with click-effect and gold contacts:
needs more area, but is much more reliable and is easier to use!

Large ultra bright Light Emitting Diode:
Provides a bright display (power monitor status light), low power consumption.