Product Specifications: Raspberry Pi4B USB A Male to USB C Male Cable with ON / OFF Switch. Can be used for powering up the Pi with type C connection ports for latest Raspberry Pi4B. Push the power button to turn on/off. Extra long 3.3ft power cable. Built-in 56K? pull-up resistor to prevent overheat. Not for data transfer use.,only for Power Supply. This cable alone could not support fast charging, you need fast charging supported devices and USB charging ports (like a QC/AFC protocol charger). Work well for Low-power electrical power supply,such as Raspberry Pi 4 B, USB Desk Lamp/Fan, LED Strip String. Package Contains: 1* USB Cable with On/Off Switch If you have any questions or any suggestions on our products in Electop, please feel free to reach us via Email or Amazon in-out email.We will reply you in 24 hours.