2S-8S LiPo, Li-ion, and LiFe battery voltage checker and low voltage buzzer alarm.
Display modes: Total voltage, voltage of individual cells, voltage of highest cell, voltage of lowest cell, voltage difference between cells.
Alarm set value range: off, 2.7V – 3.8V.
Default alarm setting: 3.3V.

Made by the original manufacturer of this product, higher quality and reliability than those cheaper copies.