Feature: 1. Excellent Sensor: Ultrasonic water tank liquid level sensor, which can turn off or turn on the pump, activate the alarm and light when detecting high or low water levels, which is efficient and practical. 2. Wireless Transfer: This liquid level sensor has a cordless design, making it convenient to use anytime, anywhere. The wireless transmissing distance is up to 100M (open areas), and you can place it anywhere. 3. Temp Change Monitoring: This ultrasonic level meter supports temperature change monitoring, effectively targeting liquids that require specific temperature storage, such as wine, to meet more needs. 4. Applicable Range: This ultrasonic level sensor is widely applied for monitoring and automatic control of water tank level system, and can detect the liquid level storage capacity of tanks and other containers. 5. Multiple Functions: The water level measurement range is 1‑5m, support high and low level alarm, 4.3 inch screen digital display, with backlight function. The transmitter is IP65 water proof, effectively preventing rainwater. Specification: Item Type: Ultrasonic Level Sensor Material: ABS Power Supply: Receiver: 3 x AAA Battery (not included) or DC 5V Power Cable Transmitter: 6 x AAA NiMH Battery, 900mAh Each (built in) (with solar panel for automatic recharging when exposed to sunlight) Features: 1. Backlight On and Off Function 2. 12H/24H Time Format (startup default display: 0:00 24 hours) 3. Low Battery Reminder for Transmitter 4. Alarm Clock Function (startup default display: 0:00) 5. Buzzer On and Off (only affects button sound, not alarm clock sound) 6. Indoor Temperature ℃ and ℉ (Default ℃) 7. Data Signal Indicator 8. Water Tank Temperature ℃ and ℉ (Default ℃) 9. Water Tank Level Display Unit: m and ft (startup default: m) 10. High Low Water Level Alarm Mode 11. Alarm Sound On and Off Icon Display (default on) 12. Alarm Duration: 120 seconds 13. High Low Water Level Icon Display 14. Water Level Depth Shown on 10 Elements LCD Bar Graph Receiver Indoor Temperature Range: 0℃-50℃, 32℉-122℉ Transmitter Water Tank Temperature Measurement Range: -40℃-60℃, -40℉-140℉ Water Level Measurement Range: Approx. 1-5m / 3.3-16.4ft Temperature Resolution: 0.1℃, Accuracy: ±1℃ Water Level Resolution: 0.01m, Accuracy: ±0.05m Transmitter Protecting Grade: IP65 (effective guard against rain from any direction) Wireless Transmissing Frequency: 433Hz Open Distance: Approx. 100m / 328.1ft Effective Distance: Approx. 30m / 98.4ft Screen Size: 4.3 inch. Package List: 1 x Receiver 1 x Transmitter 1 x Charging Cable 2 x Screws 1 x User Manual