Specifications: Material: ABS Voltage measurement ranges (External power supply): 0-120V Voltage measurement ranges (Self-powered): 10-120V Voltage resolution: 0.01V Current measurement ranges: 0~400A Current resolution: 0.1A Temperature measurement ranges: -20~120℃ AH measurement ranges: 0~9999.99AH Voltage accuracy: ±2%+3 digits Current accuracy: ±5%+10 digits BT communication distance: 10M Package size:250 * 180 * 55mm / 9.8 * 7.1 * 2.2in Package weight: 600g / 1.3lb This color screen wireless BT battery coulomb meter is a professional instrument for monitoring battery power, and it can also monitor the voltage, current, power, ambient temperature, and energy of the battery during recharging and discharging. Real-time display of how long the battery can be fully charged and how long the remaining battery power can be used. It is the perfect helper in your daily works or use, come and have a try, it will not let you down. Note: This software only supports Android 5.0 and more advanced systems. It will apply for location during the installation. Please agree and turn on location services. Please check the above information before placing an order, thank you for your understanding. Features: Adopt 2.4 inch color screen, more larger and easier for you to read the data, give you a better using experience. Automatically identify the current in both recharging and discharging directions. Using current*working time to calculate the capacity of recharging and discharging, which is more accurate than calculating the remaining capacity by voltage. The mobilephone APP can connect to the meter through wireless BT to view data and set parameters, and upgrade the firmware of the measurement module, also support the real-time curve and historical curve of voltage and current view, and historical data export. (Only for Android) The shunt and the screws are made of pure copper material, and the power consumption in standby mode is low. After configuring the relay, it can realize over-voltage protections, under-voltage protections, over-current protections, over-temperature protections, and over-power protections. (the relays NOT included) The parameters of voltage, current and temperature can be calibrated by themselves. The display and measurement module are connected through a 5.0 meter telephone line, and the maximum length can be extended to 30 meters, which is more convenient for installation. 0-120V lead-acid batteries, lithium batteries, iron-lithium batteries and all other batteries can be used. Packing list: 1 * Display Module 1 * 3P Terminal 1 * Measuring Module 1 * Communication Cable (5.0m) 1 * Sampler 1 * 3P Connection Cable 1 * Temperature Sensors 1 * 4P Connection Cable