Features: It can display voltage, current, power, capacity, energy, temperature and operation in real for time. 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. Using high-performance for DC Hall sensor to collect current, safe, convenient and accurate. 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 reset, does not affect the direct charge and discharge metering. Specifications: Display header: approx 78x42x25mm/3.1x1.7x1in Transformer module: approx 56x36x56mm/2.2x1.4x2.2in Packing size: approx 13x8.2x9.2cm/5x3.2x3.6in Standard: 50A/100A/200A/300A/500A 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 and 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 error correction 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. Package includes: 1x Battery Management System