Main features: 1, the use of radio frequency technology, wireless transmission of information. Waterproof, moisture-proof, dust-proof, anti-attack. 2, a table, a meter card, ensure security, unique, non-proliferation and non-repeatability. From the variety of ways to eliminate the possibility of manufacturing counterfeit cards. 3, the square magnetic interference function: When the meter by the magnetic field interference, water valves automatically shut down, the valve can not be opened before the magnetic interference is not eliminated, the magnetic interference cancellation, the available user card to open the valve. 4, the balance alarm function: When the meter remaining water is less than equal to the alarm set value, the buzzer sounded a bit "bit" alarm sound when the remaining water 2m3, the valve closes the alarm, turn off the alarm, the user a valid user card and the meter to communicate properly to open the valve using the remaining water. When only after re-purchase water before normal use. 5, the battery voltage shut valve function: When the battery power is low, the valve automatically shut down, and save water information. 6, the data write-back function: each time a user to purchase water management terminal from the RF IC card withdrawal water table data. 7, complement card loss: If the card is lost, to the management terminal output corresponding to the up card procedures. Up card of the system, the meta-user card void. 8 LCD LCD: display intuitive. Timer switch valve: with timer switch valve function, effectively prevent the valve is not closed for a long rusted.