Battery monitoring alarm tester, low voltage alarm mode: 1S-8S, alarm set value range: OFF-2.5-3.8, voltage detection precision: +/-0.01V. Compatible with 1-8s Lipo/Li-ion/LiMn/Li-fe RC battery, the pin space is about 3 mm (0.12 inch) straight pin. Just insert the balance plug, automatically detect the voltage and total voltage of each battery cell, support reverse connection protection. When the voltage is lower than the set value, the buzzer will ring and the red LED light will flash. The factory default is 3.3v. Press the button to change the voltage setting value and save it automatically. Battery cell voltages, total voltages, lowest cell voltage, remaining battery capacity. Cycle display battery working status, protect battery from over-charging or over-discharging. Used for 1S-8S lithium battery detection Voltage detection accuracy: 0.01V Group voltage display range: 0.5V~4.5V Total voltage display range: 0.5V~36V 1S test mode voltage range: 3.7V~30V Low voltage buzzer alarm mode: 2S-8S Alarm voltage setting range: OFF~2.7~3.8V Product size: 40x 25x 11mm Material:plastic colour:Black Package Contents: 4 x Lipo Battery Tester Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.