Features: Wide range of applications,small appearance Simple to use and easy to understand Intelligent-chip control, clear LCD display, accurate measurement. The minimum discharge stop voltage of 18650 battery is 2.75V. In general, when the voltage is reduced to 0.875times of the rated-voltage (3.24V), it should be charged, and if it continues to be used, the voltage will drop rapidly, and it may be damaged by overdischarge, which will affect the life-span. (recommended discharge termination voltage set to 3.5V). The charging voltage is generally 4.20V-4.3V. Specifications: Material:ABS Product model: XH-M239 Display accuracy: 0.1 Measurement accuracy: 1mAH Power supply voltage: DC5-12V/18650 battery (delivery without battery) Standby current: 5-7mA Discharge current: about 500mA Load power: 10W 8 Size:Approx.11.1x9.7x2.5cm/4.37x3.82x0.98 inches 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. Package includes: 1x Battery Capacity Tester