Nein, ist sie nicht.
Instruction :
Make sure to connect the Lipoion connector to the connector of this Alarm, at the same time,the connectors negative of battery must connect to the connectors negative of the alarm
When a battery cell voltage is higher than 4.3v, the homologous LED will be flashing red light slowly and beep; When a battery cell voltage is between 4.3v to 3.0, the homologous LED will be green persistently; but no Beep. When a battery cell voltage is lower than 3.0v, the homologous LED will be flashing red light quickly and Beep
Spec.
Lipoly Range: 2s~3s
Size: 38x20x10mm
Weight: 5g
Voltage Accuracy: 0.03v
Low Voltage Alarm Threshold: 3.3v (per cell)