Underground Open Measurement Ultrasonic Liquid Level Meter Product function introduction: 1. Backlight onoff function 2. Time function 12H24H system (default display at startup: 0:00 24 hours) 3. Transmitter low battery reminder 4. Alarm clock function (power-on default: off) 5. Buzzer onoff 6. Indoor temperature CelsiusFahrenheit (default Celsius) 7. Data signal indication 8. Water tank temperature CelsiusFahrenheit (default Celsius) 9. Water pump control box power output indication 10. Water tank water level displays metersfeet (power-on default: meters) 11. Low water icon 12. Water level depth simulated on 10-element LCD bar graph 13. Working voltage of water pump control box: AC 110-230V 14. Receiver: 3xAAA 1.5V 900mAh (not included), receiver battery life is 12 months, no backlight activation at reference time 15. Transmitter: 6xAAA 1.2V NiMH 900mAh (included), transmitter battery life is 12 months (reference time is not exposed to sunlight) 16. Note: The water pump control box, transmitter and receiver communicate wirelessly at 433MHz, and the transmission distance can reach 100 meters in open areas. 17. Note: The solar panel provides auxiliary power and has a rechargeable battery charging function. Please use nickel-metal hydride rechargeable batteries (which can reduce the frequency of battery replacement and save battery usage costs to a certain extent). When installing, please install the solar panel. Towards the sun to power and charge rechargeable batteries when exposed to sunlight Describe: 1. Transmitter weight: 137g 2. Receiver weight: 161g 3. Water pump control box weight: 134g 4. Transmitter size: 6.8x10.9x16.7cm 5. Receiver size: 13.5x2.6x8.4cm 6. Water pump control box size: 7x3.5x13cm Packing list: - TYPE-C power cord x 1 - Instruction manual x 1 - Screws x 3