Used type: 1S-8S Li-Po Battery
Voltage Detecting Precision: ±0.01V
Cell Voltage Display Range: 0.5V~4.5V
Total Voltage Display Range: 0.5V~36V
1S Test Mode Voltage Range: 3.7V~30V
Low Voltage Alarm Mode for 2S~8S
Alarm Voltage Setting Range: OFF~2.7V~3.8V
Dimension: 40*25*11mm
Weight: 9g

Note: Voltage setting button is between two horns, you can adjust the value you want