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SmartMOUNT - The LED is quickly and easily mounted on the always visible cable. This is especially important for a battery that does not leave the truck. SmartBEEP - This unique beeper adds an audible dimension to communicating the need to water and helps operators identify a battery that needs water even if SmartBlinky Pro can't be seen. The frequency of the beep indicates how many days the electrolyte has been low. Even if the LED is ignored, you will still know it needs water, and management will be alerted if maintenance is not being carried out. SmartDELAY - The SmartDELAY optimizes battery filling while preventing boil-over. The electrolyte level in a battery can rise and fall several times a day. With SmartDELAY, the SmartBlinky Pro’s LED only turns red when the electrolyte level has been low for over 24 hours, reducing the risk of incorrect watering and reducing the filling frequency.