Welcome to our store! This RC battery low voltage alarm features an LED display showing the voltage in normal mode. Press the button to enter voltage setting mode; the voltage number will blink slowly. Press the button again to adjust the voltage value, increasing by 0.5V each time (cycling from maximum to minimum). Wait approximately 3 seconds without pressing the button to exit voltage setting mode, saving the voltage value. When the voltage is lower than the set low voltage value, the buzzer will activate and the display will flash rapidly as an alarm. Item Type: RC Battery Low Voltage Alarm Material: Plastic Size: Approx. 40 x 33 x 25 mm / 1.6 x 1.3 x 1 inch (without cables) Battery Support: 2-4S battery Power Interface: JST Type: RC Accessory Quantity: 1 Suitable for 1:8/1:10 remote control car (for SCX10/TRX4, etc.) Normal Mode: The car battery's LED display shows the voltage value. Voltage Alarm Setting Method: Press the button to enter voltage setting mode. The voltage number will blink slowly. Press the button again to change this value, increasing by 0.5V each time. Wait about 3 seconds without pressing to exit and save the voltage value. Note: The default voltage is 6.5V, and the changed voltage is saved even after power off. Set the voltage to 6-15V. Low Voltage Alarm: When the voltage is lower than the set low voltage, the buzzer sounds continuously, and the display flashes rapidly. Note: Once the alarm is triggered, it cannot be canceled unless the power is cycled. The setting mode is still available in the alarm state, but the alarm must be re-triggered after adjustment. Package Includes: 1 x Low Voltage Alarm, 1 x Manual If you receive your item and find any product issues, such as damage or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory customer service.