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Breadboard Power Supply Module: This module is designed to charge the breadboard for you easy to do experiments in the breadboard. Improved Charging Modes: You can use USB-C to charge this module directly to supply power to the breadboard or insert a 18650 rechargeable battery into the battery slot of this module to supply power. There are four led lights to show how much electric quantity left, which is very convenient for you checking the electric quantity and keep your experiments stable. The maximum output current of this module is 2.4A, but we very suggest you use it under 2A considering the module heating problem and life span. And the output voltage is 3.3V or 5V. This module equips with USB Type-A connector for power output to external device, which can be regarded as a power bank to supply power for smart phone or other devices.