1-8S Lipo Li-ion Battery Voltage Tester Monitor Low Voltage Buzzer Alarm Description: This low-voltage alarm for 1-8S lithium batteries detects the voltage of each cell and the total voltage, automatically triggering an alarm when the voltage is too low. It allows you to monitor the operational status of your battery at any time, preventing damage caused by over-discharge or over-charge. When the voltage drops below the set value, the buzzer sounds and the red LED flashes; the factory default setting is 3.3V. Pressing the button allows you to change the voltage setting, which is automatically saved. Specifications: Name: Voltage Tester Application: 1S-8S lithium battery detection Voltage detection accuracy: ±0.01V. Group voltage display range: 0.5V to 4.5V Total voltage display range: 0.5V to 36V 1S test mode voltage range: 3.7V to 30V Low voltage buzzer alarm mode: 2S to 8S Alarm voltage setting range: OFF to 2.7 to 3.8V Package Included: 1 x RC Airplane Low Voltage Alarm Note: Please allow minor error due to manual measurement. The colors may be a little difference for the different monitor display.