Air Condition Vest: Fan vest is recommed to use 5V 2.0A power bank, don't use the voltage over 5V . Package is included 2 fans+ 1 cable+ 1 Cool Vest. This air conditioned suit does NOT INCLUDE BATTERY. You can use your own power bank. Creative Cooling Vest: Come with removable fan that moves fresh air along the back and shoulder, sweat evaporates instantaneously that make you feel cooling in hot day. cool vest that manages heat stress. 3 Fan Speeds Setting: Evaporative cooling vest has three air flow modes so you can adjust the air flow to the work conditions. 9 blades design support large air volume. Three levels of air volume (strong, medium, and weak). U-V resistant & Reflective Cooling Vest Fan: Body cooling vest made of 100% polyester, skin-friendly fabric. It is also a sun protection vest that heat resistant, breathability. light weight for easy to carry, also good for travelling. Also there are reflective strap on shoulder that keep you safe in night. Wearable Cool Vest Application: Suitable for worker, contruction,gardening, hiking, walking, kitchen cook, guide, farmer or warehouse worker, also a great solution for MS people.