2S 18650 Lithium Battery Capacity Indicator Module Level Tester LED

From the shop's description

2S 18650 Lithium Battery Capacity Indicator Module Level Tester LED Intelligent electricity quantity display board; slightly push trigger switch, it will auto power off after 3 seconds display. LED Indication: 25% –>First Light is on (Voltage: 2.1 V) 50% –>Second light is on (Voltage: 4.2 V) 75% –>Third light is on (Voltage: 6.3 V) 100% –>Fourth light is on (Voltage:8.4 V) Features: The intelligent power display panel Static power consumption 2~3 mA, It’s negligible Power indication(The color of the lamp is green) Package Includes: 1 x 2S 18650 Lithium Battery Capacity Indicator Module Level Tester LED Product Type 2S 18650 Lithium Battery Current Consumption (mA): 2~3 Shipping Weight 0.02 kg Shipping Dimensions 5 × 1 × 1 cm