brand new and high quality Features: Ultra-thin Electricity display, 5 LED indicators, display more intuitive and more beautiful. Connect the positive and negative terminal of the display board and connect it to the positive and negative ends of the battery to be tested. Lightly press the red button with your finger and the IED lamp lights up to show the real-time battery power. Loosen your finger and the LED light will be extinguished after 3-5 seconds of delay. No power will be consumed during static operation. 3.7V lithium battery, full charge 4.2V. 3.7V lithium battery uses a red power indicator, 4 green power indicator (the other voltage range is 1 red power indicator, 4 blue power indicator) Display Electricity Quantity Parameter:(The following data is a reference value, there will be 2% error range) 1.When battery voltage is over Nx3.2V, it will illuminate 1 block electricity quantity (note: N represents battery quantity) 2.When battery voltage is over Nx3.4V, it will illuminate 2 blocks electricity quantity 3.When battery voltage is over Nx3.6V, it will illuminate 3 blocks electricity quantity 4.When battery voltage is over Nx3.8V, it will illuminate 4 blocks electricity quantity Specification: Voltage: 3.7V, full charge 4.2V Display: 5 LED Dimensions: 1.5x4cm/0.59x1.57inch Quantity: 1 Pc Package includes: 1 x 3.7V Lithium Battery Power Level Indicator Module