Product Description: This voltage display is designed for 1S~8S lithium battery detection, automatically detecting the voltage and total voltage of each cell. It features reverse connection protection. Know your battery's status anytime, anywhere, preventing damage from improper over-discharge or over-charge. Whether in the air or in standby mode, connect the EM display to the battery's balance charging connector to check the battery's charging status. When the voltage drops below the set value, the buzzer sounds and the red LED indicator flashes; the default value is 3.3V. Press the button to change the set voltage value and automatically save your current setting. Product Parameters: 1. For 1S-8S lithium battery detection 2. Voltage detection accuracy: ±0.01V. 3. Group voltage display range: 0.5V ~ 4.5V 4. Total voltage display range: 0.5V ~ 36V 5. 1S test mode voltage range: 3.7V ~ 30V 6. Low voltage buzzer alarm mode 2S - 8S 7. Alarm voltage setting range: OFF~2.7~3.8V 8. Dimensions: 40mm x 25mm x 11mm Instructions: With the screen facing up (digital display side), connect it towards you and insert the battery's white balance charging connector along the left pin of the screen. The screen will immediately emit two BB sounds and the jump number will be displayed. If there is no response, connect the scale charging connector in reverse order. There is a small button at the other end of the electric display, which is used to adjust the electric display's alarm voltage.