Features: This coulomb counter is suitable for all kinds of electric vehicles, emergency power supplies, energy storage power supplies, medical equipment, RVs, etc. The voltage range is 8-120V. Withstand high voltage and high current. Adjustable backlight brightness, real-time power/voltage/current/power detection. Low battery alarm. 32-bit ARM chip, widely used. Multiple choices, low pressure alarm function. Specifications: Material:ABS Size:Approx.10x6x1.8cm/3.93x2.36x0.7inches Style: 50A/100A TF03K has been upgraded to TF03KH, the new version can adjust the backlight brightness Package Includes: 1x Display Table 1x Sampler 1x 1M Shielded Wire 1x Instruction note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.