ITEM NAME:Lithium Battery Capacity Indicator Electricity Power LED Display Board 2S 8.4V Features: 100% brand new and high quality. 1. Superthin Type Electricity Display: 5pcs LED indicator lamps. 2. Wide Application Fields:lithium battery pack. 3. Using Method: connect display board positive and negative terminals with tested battery positive and negative port. 4. Slightly hold down the red button with your finger, then LED lights will be on and show real-time battery electricity quantity.(Note: The first LED light is for power Indicator light) 5. Release the finger, the LED lights will be off after 3-5 seconds delay, it completely does not consume electricity when in the static state. 6. With anti-transposition function, even if the positive and negative ports are connected with wrong direction and it will not burn, simply correct it. Lithium Battery Pack Display Electricity Quantity Parameter: (note: N represents battery quantity) 1. When battery voltage is over N*3.2V, it will illuminate 1 block electricity quantity. 2. When battery voltage is over N*3.4V, it will illuminate 2 blocks electricity quantity. 3. When battery voltage is over N*3.6V, it will illuminate 3 blocks electricity quantity. 4. When battery voltage is over N*3.9V, it will illuminate 4 blocks electricity quantity. 5. When battery voltage is less than N*3.2V, 4 blocks display will be off; it represents battery is less than 3.2V, and you can charge the battery. Specifications: Material: Plastic and Metal Color: shown as pictures Size: 60×15×2.5mm/2.36×0.59×0.10in (Approx.) Type: 2S(2 Series) 2 Series voltage range: 6.6V-8.4V Quantity: 1 PC (other accessories demo in the picture is not included) Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you.2S 8.4V Lithium Battery Capacity Indicator Electricity Power LED Display Board. Type: 2S(2 Series). (Note: The first LED light is for power Indicator light). Quantity: 1 PC (other accessories demo in the picture is not included).