Product parameters: 1. Working current: 10mA 2. Display mode: LED indicator 3. Refresh rate: 500ms/time 4. Appearance size: 46mm*15mm*3mm 5. Product model: 4615 6. Product working voltage: DC5V-30V Function setting description: 1. Press and hold the button for 2 seconds to enter the setting state: the mode light (battery type) flashes, and the string number light is always on; short press the button to select the battery type. 2. After confirming the battery type, press and hold the button for 2 seconds to enter the serial number/voltage setting (the mode light is always on, and the serial number/voltage light flashes). 3. Short press the button to set the number of strings or voltage of the battery; for details, please refer to the above table for option settings. 4. After setting, press and hold the button for 2 seconds to save the data and return to the display battery status (or wait for 5 seconds to automatically return). 5. In the setting state, if there is no operation button within 5 seconds, it will automatically return to the normal display power. Notice:  1. Please do not exceed the operating voltage. Exceeding the operating voltage will damage the product. 2. The product has two versions of high and low voltage, please select the electricity meter within the voltage range. 3. Please do not use this product outdoors, this product is not waterproo