This product is suitable for roacute; RC batteries, such as LiPo/Li-ion/Li-Mn/Li-battery Fe. When the voltage is below the preset value, there will be a buzzer with a red LED, preset to 3.3V. Press the key that; ry can change the voltage setting and save. Features: Sharp screen LCD display, applicable to low-light conditions Compact and extremely portable Suitable for roacute; different types; in RC battery, such as LiPo/Li-ion/Li-Mn/Li-Fe battery Easy to install Specification: Weight: 14g Dimension: 44*32*14mm Display: LED Voltage Sensing Precision: plusmn; 0.01V Range Unit Voltage Indicator: 0.5-4.5V Total Range Voltage Indicator: 0.6-36V 1S Test Mode Voltage Range: 3.7-30V Low Voltage Alarm Mode for: 2-8S Alarm Set; in the value range: OFF-2.7-3.8V Package Included: 2PCS/1PCS x Lipo Battery Voltage Tester