Specification: Input voltage: Input voltage 7-28V (including car 12V), with reverse connection protection (no need to worry about the wrong connection between positive and negative). Output voltage: USB output 5V2A (adaptive) Version: T plug version /XT60 plug version (2 choose 1) Product application: lithium battery can be used as a power bank (equipped with USB data cable by yourself) Packing size: 85*15*10mm Total weight: 20g Product Features: 1.Aviation model lithium battery can be used as a power bank. 2.Air model enthusiasts will have a lot of lithium batteries, you can use idle lithium batteries or aircraft after the motor to charge the phone. 3.Can be used as a battery display. 4.Check the battery voltage at any time to avoid overdischarge of lithium battery (only check the total voltage). 5.It can be used as a 5V step-down module. 6.Cut the output + and - heat shrinkable film. 7.Self welding can be used as 5V step-down module. 8.Easy to carry in the outfield. 9.Compact appearance锛孴he tool box can be stored锛宐e easy to carry about. Usage Method: 1. Use of power bank Insert the battery at the input end (7-28V),the USB indicator light is on, and the USB port at the output end is inserted into the charging cable of the mobile phone, which can be charged. 2.Use of electric display Insert the battery at the input end (7-28V), the USB indicator light is on, and the total voltage of the battery is displayed on the voltage display screen. 3. Use 5V step-down module Cut the heat-shrinkable film and solder it by itself. It can be used as a 5V step-down module with 5V2A output. Package Included: 1x Mayatech 3 in 1 Lipo Battery Discharge Tester