Features: 【Multiple voltages Output】Supports double voltages outputs of 12V and 9V to meet the requirements of various air conditioning units. 【High-efficiency Charging Performance】Features an integrated high-efficiency PCB board to ensuring rapid charging efficiency. Even after prolonged use, it can quick restoring to full charging. 【Robust Durability】Constructed from premium ABS offering excellent impacts resistance and wear-proof properties. 【Portable Design】Lightweight construction facilitates easy carrying. 【Safety Protections】Features multiple safeguards including overcharge, over-discharge, and short-circuits protections, delivering a secure and reliabled user experience. Specifications: Component: ABS+PCB Size: 10.8x8.4cm Battery compartment size: 70x84x21MM Batteries that can be installed: (for 21700x4) (not included) TYPE C input and output: PD20W USB output 22.5W:5V3A/4.5V5A/9V2A/12V1.5A DC38135 output: equipped with fan gear adjustment 12V red light/11V high-grade yellow light/10V middle grade blue light/9V low-grade green light (when the gear is at the 12V output, it will automatically reduce to the second output after 15 minutes) Package Includes: 1 Set 22.5W 21700 Battery Holder Case note: After connecting the battery（not inculded）,it must be charged and activated before use. This product is a case only; assembly requires professional installation. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution