Multi-Functional 3V - 5V Time Delay Relay Timer REVOLUTIONARY CIRCUIT DESIGN - Equipped with many commonly used timer delay functions. MULTI-FUNCTIONAL - It is perfect for amplifier delay, industrial control, hobby projects etc. SECOND GENERATION - Added trigger control, number of timer functions, simplified programming, increased maximum, transient voltage suppressor, and fly back current diode. INPUT VOLTAGE - 3v  5v. MADE IN AMERICA - Waterproof, designed for outdoors.