Features TRUE MEASUREMENT: Users can measure the corresponding parameters according to the actual situation, current voltage and battery capacity percentage. SAFETY USE: With low voltage alarm, which is adjustable, could automatic shutdown, reduce consumption, with discharge protection, extends battery life. WIDE COMPATIBILITY: Support lithium battery, acid battery, lithium iron phosphate battery, and can also be used for other types of batteries and power supplies, also support multiple batteries in series. DIGITAL DISPLAY: Adopt high brightness digital tube display, the parameters can be viewed clearly and intuitively. WIDE APPLICATION: This test module is widely used in automobile, mobile equipment, ships, outdoor equipment and other applications. Specification: Item Type: Battery True Capacity Module Material: ABS Model: XH M240 Display Accuracy: 0.1 Measurement Accuracy: 1 АН Power Supply Voltage: DC 5-12V, 2 x 18650 lithium battery (shipped without battery) Standby Current: 5-7mA Load Power: 10W 8Ω Installation Aperture: Approx. 3mm/0.1in Package List:1 x Battery True Capacity Module Note:Pay attention to safety. Package List 1 x Battery True Capacity Module