1. The 2.4-inch high-definition color screen, the color matching is beautiful and generous, and the font is larger and clearer;2. Provide a mobile phone APP, which connects to the meter via wireless Bluetooth to view data and set parameters;3. The mobile APP can view the real-time curve and historical curve of voltage and current, and historical data can be exported;4. The display and measurement module are connected through a 3Meter 4P co-directional telephone line, the longest can be extended to 30 meters, which is more convenient to install;5. Both shunts and screws are made of pure copper materials to minimize power consumption in standby mode;6. After configuring the relay by yourself, it can realize over-voltage protection, under-voltage protection, over-current protection, over-temperature protection, and over-power protection.7. The mobile phone APP can upgrade the wireless firmware of the measurement module;8. The parameters of voltage, current and temperature can be calibrated by themselves;Product name: coulomb meterWorking voltage: 9~100vCapacity range: 0~99999AhWorking current: 7.5mAThe current after closed backlight: 3.5mAVoltage precision: 1%(1 C)Current precision: 1%(1 C)Capacity precision: 1%(1 C)Size: 79x43x27mmCut hole size: 76.5x39.5mmLCD size: 49x24mmWorking temperature: -10~65CelsiusWire length: 15cmColour:As shownMaterial:plasticPackage Contents:1 x Coulomb Meter(400A)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.