Features: Transform your collection of 18650 batteries into a powerful, no need welding power sources with this innovative DIY Power Case featuring QC3.0 and PD technology for rapid charging. The case detachable design and digital display offer convenience and ease of use, while its compatibility for flat head 18650 batteries ensures a customizable charging solution. Suitable for enthusiasts and frequent travelers, this case caters to those who demand reliable power for their multiple devices on the go. Power Case only, other accessories demo in the picture is not included! Tip: 18650 batteries are not included in the package, you need to purchase separately. Can only use the 18650 battery of which positive electrode is flat top. Please pay attention to the direction of the positive and negative poles. Specifications: Component:Plastic Number of batteries: 40x18650 batteries Color:Black,White; Size:Approx.187x82x100mm/7.36x3.23x3.94inch 6Option Type C40 Case Output:5V2.10A C40 Case Input:5V2.10A C40 PD Case Output:5V3.10A-9V2.22A/12V1.67A/4.5V5A/5V4.5A C40 PD Case Input:5V3A/9V2A/12V1.5A C40 PD Case3 Output:5V3.10A-9V2.22A/12V1.67A/4.5V5A/5V4.5A Wireless Charging:5W/7.5W/10W/15W C40 PD Case3 Input:5V3A/9V2A/12V1.5A Support Fast Charging Protocols:QC2.0,BC1.2, Package Includes: 1pc Battery Case(Battery not include) note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.