Thank you for viewing. This is an introduction to a convenient vest that allows you to turn instant cooling ON/OFF, perfect for this time of year when the heat continues. This vest is designed to be worn under a shirt, so it's invisible from the outside. Product Name: Peltier Vest T4 Size: Free Size Material: Mesh Power Source: Dedicated battery included. Operating Time: Strong Mode: Approximately 5-6 hours Weak Mode: Approximately 7-8 hours Weight: Approximately 568g ◽️Instruction Manual: Included Dedicated Battery Charging Cord: Included ◽️After confirming the operation, it was stored unused, but I am selling it because I have no plans to use it.