Features: Two-way current detection, detection of charge and discharge users can be very convenient to detect two-way current, without changing the direction of wiring. Memory function of power outage, after power outage can remember the ampere hour (AH) before power outage, convenient observation and measurement. Ampere hour (AH) number one for key can be filled or cleared, does not affect the direct charge and discharge measurement. Voltage, current, ampere-hour, watt-hour, for time, power, temperature display at the same for time, display information comprehensive clear. With output off function for key, flexible open or off output. With over voltage, over current, over power, under voltage for protection and temperature control functions. Can be calibrated online, convenient for customers to correct errors in for time. The LCD screen can automatically turn off and light up to reduce product power consumption. Switching voltage & current waveform display function, more intuitive observation of voltage and current change curve. The relay port can be switched to the buzzer port to realize the sound alarm function. Undervoltage capacity can be automatically reset, overvoltage capacity can be automatically filled to facilitate long-term recycling customers, automatic correction error. Specifications: Material: palstic Size: approx 7.9x4.3cm/3.1x1.7in Accuracy: 0.01A Power supply: 6-90V Package Includes: 1x Battery Monitor note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.