Features: 1, Single button, dual flush, the button can be fixed on random place; 2, The water level can be adjusted; 3, Water inlet: G1/2" or other; 4, Water outlet (Flushing): φ50mm or other; 5, High flush flow rate: >2.2 L/S; 6, High fill flow rate: <83 second at 0.05MPa, 9 Liter; 7, Low noise of filling: <48 dB; 8, Suitable range of water pressure: 0.02-0.9MPa; 9, Excellent compatibility with almost all types of toilet, so it is very fit for rebuilding old toilet without changing toilet body; 10, Easy to install as a Do-It-Yourself product; 11, Installed in the toilet that the cistern and the pan are integrated.