About This LONG MEASURING DISTANCE: 4 to 118 inches from the sensor, which is suitable for different tanks. POWER ADAPTER: Input: 100-240V AC Output:5V DC WIFI SIGNAL:The sensor needs to connect to router to get wifi signal.Wifi range is 11.8 inches when no obstacle SAFETY AND HIGH RELIABILITY:IP67 waterproof.CE,Rohs and Reach certification. REMOTE OIL TANK MONITORING: Check your tank level from your smartphone – anytime, anywhere! No need to open the tank from time to time. FULL AND LOW LEVEL ALERTS: You will receive message alerts when it is full or low level. Or set the alarm level by app MULTI TANK MORNITORING:One app can monitor as many as 100 sensors.You can connect multi tanks easily EASY TO INSTALL:There is a nut to install the sensor.Install the sensor on top of the tank. NON CONTACT ULTRASONIC LEVEL SENSOR: adapt to acid, alkali, salt, high temperature occasions OPERATING TEMPERATURE RANGE-10℃~+70℃: suitable for most weather conditions.