Description: Features: brand new and high quality. 1. Battery type electricity quantity display. 2. Wide application fields: lithium battery. 3. Using Method: connect display board positive and negative port with tested battery positive and negative port, digital tube will display real-time battery electricity quantity. 4. Digital Color: outline red, display block blue (when battery electricity quantity is full, it will be all on). Display Electricity Quantity Parameter: (note:N represents battery quantity) 1.When battery voltage is over N*3.3V, it will illuminate 1 block electricity quantity. 2.When battery voltage is over N*3.5V, it will illuminate 2 blocks electricity quantity. 3.When battery voltage is over N*3.7V, 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*3.3V, 4 blocks display will be off; it represents battery is less than 3.3V, and you can charge the battery. Specifications: Material: Plastic and Metal for Shell Color: Black Digital Color: outline Red, display block Blue Type: 1#: Without for case version; 2#: With for case version (Optional) Without for case version: 1S Single 3.7V Lithium Battery Capacity Indicator Module 4.2V Blue Display Electric Vehicle Battery Power Tester Li-po Li-ion With for case version: 1S 3.7V Lithium Battery Capacity Indicator Module 4.2V Blue Display Electric Vehicle Battery Power Tester Li-ion With Shell Size: Without for case version: 3120mm/1.220.79in (Approx.) With for case version: 482921mm/1.891.140.83in (Approx.) 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 bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 X Lithium Battery Capacity Indicator Module (No retail package)