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O TAP is a smart faucet, indicating the remaining water from a pre-determined amount to be used for a month. O TAP visualizes the desired monthly water bill and divides the targeted consumption into 4 weeks on its LED display for facilitated tracking. The graphic visualization of the countdown is easy to engage for everyone in the household from children to elderly to initiate the habit of using the water efficiently. By using the more persuasive effect of numbers going down rather than up, the countdown effect offers a chance to actually save our water before it goes to waste.