2 in 1 Charge and Discharger(Buck) modules Charge voltage: DC 4.5V-6V(Recommend DC 5V) Charging current: 0-500mA Full charge voltage: 4.24V(and-1 percent ) Bat to Vo LDO current(Vo=3V or 3.3V): 0-250mA Bat to Vo LDO quiescent current(Vo=3V or 3.3V)quiescent current: 2uA Note:This module without lithium battery over-discharge protection,Matching protection board Applications:AA AAA Dry cell powered equipment Battery powered equipment:Lithium Battery 18650 14500,UPS power supply equipment diy,Solar charging,STM32 FPGA or CPLD PIC AVR Board,Electronic diy kit, Wifi Module: ESP8266 ESP32 Bluetooth-Compatible Module:HC-05 HC-06 SPP-C Pin Description: Vo 200MA LDO output positive pole(3V or 3.3V) B Battery Charging positive pole(4.24V) Vi Input Power positive pole(4.5-6V) G GND(0V) The printing or appearance may vary from batch to batch, but it will not affect the use the actual product may have color difference due to different light or display. Colour:Green Material:PCB Package Contents: 1 x Battery Charging Discharging Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.