Product This voltage display is used for 1S~8S lithium battery detection, automatically detect the voltage and total voltage of each lithium battery cell.It takes support reverse connection protection. It lets you know your battery's working status anytime and anywhere, so that the battery will not be damaged due to a over-discharge or over-charge. Whether in flight or in sleep mode, you can plug the EM display into the battery balance charging connector to know the charging status battery. When the voltage is lower than the set value, the buzzer sounds and the red LED indicator flashes; the set value is 3.3V, press the button to change the voltage set value, and automatically save the current user set value. Product parameters: < p>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 sound alarm mode 2S - 8S 7. Alarm voltage setting range: OFF~2.7~3.8V 8. Dimensions: 40mm x 25mm x 11mm Instructions: Turn the display up (the side of the digital display), plug it in towards you and insert the battery white balance charging plug along the leftmost pin of the screen, the screen will immediately emit two BB sounds, and the jump number will display on the screen. , if there is no response, connect the scale's charging plug upside down. There is a small knob at the other end of the electric display, which is used to set the alarm voltage of the electric display.