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(+-1%) Bat to Vo current(Vo=3.3V): 0-250mA; Bat to Vo quiescent current(Vo=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/CPLD PIC AVR Board,Electronic diy kit, Wifi Module: ESP8266 ESP32 Bluetooth-Compatible Module:-05 -06 SPP-C Pin Description: Vo 200MA output positive pole(3.3V) B Battery Charging positive pole(4.24V) Vi Input Power positive pole(4.5-6V) G GND(0V) The printing/appearance from batch to batch, but it 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.