Adopts pogo pins connector design, compatible with for 5 / 4B / 3B+ Onboard Type-C port with bi-directional fast charging, supports multiple charging input / output protocols such as PD3.0, up to 40W charging power. Onboard battery fuel gauge IC for reading battery voltage, current, power, remaining capacity and other parameters. Supports I2C bus communication for monitoring the operating status of Type-C port and batteries in real time. Supports 4x 21700 Li batteries (NOT included), larger capacity and longer battery life Onboard high-power buck chip for stable 5V 6A power output. Onboard high-power buck chip for stable 5V 6A power output Supports displaying battery level on the system, easy to check the operating state of the HAT Colour:blue Material:plastic The actual product may have slight color difference or difference, which not affect the use Package Contents: 1 x UPS HAT (E) 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.