Voltage: Standard models usually operate at 220–240V AC (EU/UK plug) for Kenyan outlets, though 110V and 12V DC versions exist for specialized systems.Indicator Lights: Most replacement ballasts feature a Green light (normal operation) and a Red light/Alarm (lamp failure or ballast fault).Compatibility: Designed for 4-prong (4-pin) T5 single-ended UV bulbs found in 1 GPM or 2 GPM (gallons per minute) water sterilizers