SELF-FLUSH: it will flush automatically through infrared detection units, WATER - SAVING: it will flush one or two sections intelligently as per its different occupied time. It will flush 1.5-3L Water Flux when occupied within 10 s and it will flush 2-4L Water Flux When Occupied over 10S note water pressure should between 0.3Mpa and 0.6mpa,SANITATION: When one leaves detection zone, the machine will flush automatically. Efficient cleaning makes us convenient and hygienic, which prevent us from mutual bacteria infections,INTELLIGENCE: it is controlled by micro-computer and self -adjust detection Zone. No need to manual adjustment, LOW POWER CONSUMPTION: its 4AA alkaline batteries can be used for two and a half year at 200 cycles a day (NOTE: battery should be produced by brand manufacturer and shouldn't be stocked half year from its production date). AGAINST FOUL CHARACTER: it will flush automatically every 24 hours if it haven't been occupies, which can avoid foul Oder around room when the trap is dry.