Floureon 2 Packs RC Lipo Battery Monitor Alarm Tester Checker Low Voltage Buzzer Alarm with LED Indicator for 1-8S Lipo LiFe LiMn Li-ion Battery What You GetFloureon 2 packs RC Lipo battery monitor alarm tester for 1-8S with 1 year warranty and friendly customer service. FunctionTest the working state of lithium battery. Protect the battery from overcharging or overdischarging. Voltage ModeLow voltage alarm mode for 2-8S; Alarm set value range: OFF-2.7V-3.8V;Voltage detection precision: 0.01V. Compatible For1-8S Lipo/ Li-ion/ LiMn/ Li-Fe battery. The pin space is about 3mm (0.12inch). Straight pin. ReminderWhen the voltage lower than the set value, it will buzzer with red LED light. Pre-set value is 3.3V. Push key can change the voltage setting and save.