Features:Low pressure alarm is a Alarm which can indicate 2-3sLipoions cell voltage situation by the LED and alarmThis device can indicate the cell voltage automatically,This device can always connect to the battery and monitor the voltageall the time in order to prevent the battery overdischargingFit for 2-3S Lithium batterySpecification:Dimension: 32*18*9mm(L*W*H)Net weight:5gPackage weight:15gInstruction :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 alarmWhen 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 BeepPacking content:1 x Low pressure alarm