Fangrui Product Details Integrated Switch: Easily Control Power With The Onboard Switch, No Additional Components Required Dual Usb Design, Efficient Performance Efficient Power Management: Ensures Stable And Efficient Power For Your Project, Improving Performance And Reliability Compatibility: For Raspberry Pi 3 This Expansion Board Is An Essential Accessory For Anyone Looking To Push The Boundaries Of Their Pi Projects With A Reliable And Easy-to-install Power Solution Battery Capacity: 3800mah Maximum Amplification Current: 1.4a No-load Output Voltage: 5.1v0.1v Standard Charging Current/voltage: 1.0a 5.0v Battery Full Charge Cut-off Voltage: 4.18v-4.2v Colour:blue Material:pcb Package Contents: 1 X Expansion Board Kit 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.