LONG MEASURING DISTANCE: 10cm to 4m(4 to 157 inches) from the sensor, which is suitable for different tanks. POWER ADAPTER: Input: 100-240V AC Output: 5V DC. WIFI: Between Gateway and router(max 50m no obstacle) RF433MHz: Between sensor and Gateway (max 500m no obstacle) SAFETY AND HIGH RELIABILITY: IP65 waterproof. 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 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 10 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. OPERATING TEMPERATURE RANGE: -10-+70: suitable for most weather conditions. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Plug Type:UK Plug,it applies to Malaysia, the United Kingdom and so on. Voltage:AC100-240V Color:Yellow Material:ABS Package Contents: 1 * Water Tank Level Monitor Sensor Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.