Features: With blueteeth-compatible communication, current dual-way testing, universal tester. Wireless voltage,ammeter, temperature,capacity tester, coulomb battery management system. Hall sensor to collect current, no need to disconnect the wire, wiring convenient and safe. Over voltage, over current, under voltage, over temperature alarm function. Suitable for electric vehicle modification, rv assembly, lithium battery testing & photovoltaic system testing. Specifications: Screen size: approx 55x88x22mm/2.2x3.5x0.9in Measuring module size: approx 115x55x28mm/4.5x2.2x1.1in Packing size: approx 14.6x9x10.5cm/5.7x3.5x4.1in Type: 50A, 100A/200A/300A/500A Package Includes: 1X Battery Capacity Manager 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.