1 * 19000mAh ER34615 Li-SOCL2 Battery Battery Life: Around 7 Years (15-min Collection Interval+1440-report Interval, 25°C) Non- invasive Liquid Level Monitoring Support External Antenna or Internal Antenna Versions Built-in 3-axis Accelerometer Sensor to Monitor Device Tilt Status Distance Threshold Alarm / Distance Change Alarm / Blind Zone Alarm / Radar-echo Curve / One-click Diagnostic Applications: Sewage well Mode / Rainwater well Mode / General Mode Store up to 4,000 Historical Records Locally and Support Retransmission Support cumulative number report function for power saving (For Cellular Version) NFC and Bluetooth Enabled Material: PVDF Resolution: 1mm