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18650 X 4 Lithium Battery Shield for Arduino ESP32 ESP8266 with On-Off Button E-926 Buttons: 1. Voltage Switch, 2. ON-OFF Working Temperature: -20 °C~70 °C Output Port: USB or Expansion port Output Parameters: 5V/3A or 3V/1A Conversion Efficiency: up to 95% Supports 3V 1A voltage outputs. Supports 5V 3A voltage outputs