Specifications: Use for 1-8s Lipo/Li-ion/LiMn/li-fe. Lipo cell voltage check function. Voltage indicator function and Low voltage alarm Funtion. Protect the battery from overcharging or over-discharging. Check the working status of the lithium battery. Automatic protects against reverse connection. Each size: 4*2.5*1.1cmEach weight: 9g Battery voltage display:Voltage detection accuracy: 0.01V. Voltage indicator unit range: 0.5V-4.5V.Ca voltage indicator: 0.5V-36V.1S test mode voltage: 3.7v-30v. Alarm Mode: Low voltage alarm mode for 2-8S. Alarm set value range: OFF-2.7V-3.8V. When the voltage drops below the set value, the tester buzzes with red LED, preset value 3.3V. Press the key that can change the voltage settings and save. Tips:When the voltage is lower than the alarm value, it will beep constantly. When the product of the measured person is disconnected, the alarm will stop. Or when the cells recover, they stop beeping. Package Contents:5/10/20/50/100pcs x 1-8S Battery Voltage 2IN1 Tester Low Voltage Audible Alarm