This is a Type-C USB 5V 1A Step-Up Boost Converter with a USB Charger. Great Step-up Module with 5V input, and output 5V for many digital devices, so this is really a great module for designing a portable charger. Useful for your USB charger projects and onboard USB device supply solutions.

• Charge and discharge status indication. Red light flashes when charging; Red light is always on when full; Blue light flashes when discharging..
• Input Voltage: 3.7V-5.5V; Output Voltage & Current: 5V 1A..
• Internally installed charging and discharging power.
• Integrated charge management and discharge management. Supports trickle mode and zero voltage charging.
• Intelligent temperature control and over-temperature protection; Integrated output overvoltage protection, short circuit protection, overload protection; Integrated over-charge and over-discharge protection.
  
  Note: All the cells that are connected to the power bank module should be in a series, please don't connect the cells in parallel as this will damage the power back module and cause a heating issue in it and eventually the power bank module will stop working.