ITEM NAME:2pcs Battery Voltage Tester Low Voltage Buzzer Alarm Battery Voltage Check Product Description Description: 2pcs BX100 1-8S Lipo Battery Voltage Tester Low Voltage Buzzer Alarm Battery Voltage Checker Specifications: Color: Black Quantity: 2pcs Product size: approx. 40x25x11mm/1.57x0.98x0.43in Packing size: approx. 50x30x20mm/1.96x1.18x0.78in Net weight: approx. 40g Gross weight: approx. 80g Operation Manual: The electric display screen is upwards. Plug the battery balance plug from the left and insert the black line (negative electrode) into the display. Protection voltage setting: 1. There is a small button in the middle of the Buzzer, press the button will show different voltage, and choose the right one. 2. In general, when the lithium battery is used, the voltage of the battery can be instantly converted into an electric current and the voltage is reduced. This time, the voltage can be set slightly lower (such as 3.0~3.2V), and the voltage will alarm at 3.4V~3.5V. After the battery has stopped working, the voltage will be raised slightly. When the battery is low and alarm, do not continue to use the battery. It should be charged in time Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Included: 2 x Buzzer Alarm.Included: 2 x Buzzer Alarm. Quantity: 2pcs. When the battery is low and alarm, do not continue to use the battery. The electric display screen is upwards. Plug the battery balance plug from the left and insert the black line (negative electrode) into the display.