PLEASE CHECK YOUR WIFI SIGNAL NEAR YOUR WATER SOFTENER BEFORE PURCHASING. The EZsalt Sensor requires Wi-Fi in order to send readings to the app. Stand near your water softener to check to see if you have at least two bars of Wi-Fi signal. If so, the EZsalt Sensor will have a strong enough connection to function properly. SCREWS MAY NOT BE INCLUDED. The four screws visible in the product images may not be included in the sensor you receive. Our enclosure snaps together and does not require screws to hold it together so don’t worry if you don’t see the screws shown in the product images. There will be 2 machine screws and wing nuts included for mounting in your brine tank. NEVER RUN OUT OF SALT AGAIN- The EZsalt Sensor is a retrofittable, Wi-Fi enabled, Laser Ranging Sensor designed to fit inside any brine tank and monitor its salt level. The EZsalt Sensor 2.0 will ensure that you never forget about adding salt to your brine tank and it will notify you well before it’s too late. With our easy-to-use smartphone app you'll be able to customize your notification preferences and choose at what level you would like to receive low-salt-level alerts. SAVE THOUSANDS BY KEEPING YOUR CURRENT SYSTEM- Water softener manufacturers want you to think the only way for you to have a W-Fi enabled water softener is to go and buy their expensive, brand-new system and then pay their technician another couple hundred dollars to hook it up. With an EZsalt Sensor, you can tell them to forget about it! The EZsalt Sensor will provide you every benefit that those big expensive systems would offer you for a FRACTION of the price and time needed to install it!