Features: Smart Electricity Display Panel: This monitoring tool features bright LED lights that categorize battery fee into 4 distinct phases, showing accurate energy readings with a gentle press of the activation button. Perfect for battery electricity quantity detecting needs. Energy Saving Design: With standby consumption as low as 2.3MA, this monitoring device prevents unnecessary power drain and requires minimal attention during inactive periods. Ideal for efficient battery testing. Easy Battery Check: Simply attach the battery's positive and ground terminals to the panel for quick fee assessment, designed for routine battery maintenance and care. Works with multiple battery configurations. Auto Shutdown Function: The display panel strength down after 3 seconds of use, conserving energy while providing consistent fixes for frequent battery inspections. A must have tool for household and commercial use. Compact and consistent: Made from sturdy blue plastic, this portable monitoring device is suitable for various battery testing applications, offering convenience and durability. Great for checking battery electricity quantity efficiently. Specifications: Component : plastic Types: 1 string/2 strings/3 strings/4 strings Length: about 44.5mm/1.75inch Width: about 9mm/0.35inch Package Includes: 4x indicates Board 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.