Features:Power is more intuitive, more beautifulStatic no current, no power consumptionWider Use range:1-5 string lithium battery pack, 3-15 string of nickel-metal hydride batteries both can be used Specifications:Voltage:3.3-4.2VWide application fields:lithium batteryUsing Method:connect display board positive and negative port with tested battery positive and negative port,digital tube will display real-time battery electricity quantityDisplay Electricity Quantity Parameter:1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity)2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the batteryProduct size:about 4.1*2*0.7cm/1.65*0.79*0.28inchQuantity:1Pc Note:Size for manual measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon.And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package include:1Pc X module