Electronic dual flush valve for toilet, concealed installation, activated by infrared sensor. It features a mechanical override push button for manual operation. Dual flush system: when the user is within the sensor range for less than one minute, a reduced flush (3 liters) will take place; if the user is present within the sensor range for more than one minute, a complete (6 liters) flush will take place. Auto-adjustable sensor range which adapts to the site conditions. Remote control available to adjust thefollowing factory settings: sensor range, flush time, delay in time, delay out time, On/Off, reset.This flush valve features a low-battery indicating system and an automatic hygienic flush in case the producthas not been used in 24 hours.