Product Overview: This form is used to measure the cold water pipe (hot) water flow, product complies with GB / T778-1996 and CJ / T133-2007 standards, with prepaid, and set multiple alarm mode, to alert the user timely purchase of water, the metering accuracy, stable performance, especially suitable for water measurement and control of urban residents. Features: ○ Pre-paid functions: the two-way transfer of water through the IC card, the purchase of water after the first water, no fee automatically close the valve without water. ○ Card features: The table supports a card table, enabling water, electricity, gas, heating card. ○ status display: Users can intuitively view the meter information, such as this purchase of water, the remaining water, the cumulative amount of water, the switch valve condition, electricity reminders, clear display and intuitive. ○ pre-alarm function: When the remaining water reaches the set alarm value, the meter automatically off valve, to remind users to purchase water, users can continue to use the card until the water completely off valve is zero. ○ off valve alarm function: When the remaining water is zero, the meter automatically off valve before opening the card only after the user to purchase water valve. ○ Low-voltage protection function: When the battery is low or replace the battery, the meter automatically off valve. ○ hoarding limit function: When more than a limited amount of recharge, water will not read card purchase of water until the water remaining in the water only when reading The purchase of water is less than the sum of the fixed limit. ○ attack prevention function: When the meter by external magnetic or ferroelectric attack, the meter automatically close the valve, lift the rear of the external interference only able to open the valve, and automatically record the information in this attack. ○-replace function namely: the use of national standards designed to connect with ordinary water the same size, without changing the pipe can be replaced. ○ sewage rust-proof function: the meter automatically off valve once a month, to achieve automatic discharge valve, the valve to avoid rust, scaling and so on. ○ "three anti" function: fully sealed design, waterproof, leak-proof, anti-attack. ○ unique battery compartment design, easy to replace the battery. ○ micro-power design, quiescent current of less than 0.01uA, ensure that the battery life of more than six years. ○ electric valve adopt stainless steel floating ball valve, pressure loss, small switch valve resistance, low power consumption.