This module uses TI's special boost chip TPS63020, providing low output ripple, stable performance, and a switching frequency of up to 2.4MHz. In most cases, the output current is 900mA, which is well-suited for power supply. The module also features two modes for users to choose from: normal operation mode and power-saving mode. The module is a typical step-up/down structure with an input voltage range of 1.8-5.5V, meeting the power supply requirements for STM32, ESP32, 51 microcontrollers, and other models. The module includes a red LED output indicator and supports power-saving modes to extend battery life for connected devices. Color: Black Material: PCB + Electronic Components Input Voltage: DC 1.8-5.5V Output Current: 5V@0.9A Output Voltage: DC 5V Switching Frequency: 2.4MHZ Regulation: 5V Module Interface: Large Pin Header (2.54mm Pin) Package Contents: 1 x Automatic Boost Buck Step Up Down 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 to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.