★ Neck cooler with a 4000mAh battery, lightweight at 330g, and convenient to carry. - Product Name: Neck Cooler - Model Number: TC30 - Battery Capacity: 4000mAh - Input Voltage: DC5V 2.0A Max - Body Size: 195*180*60mm - Body Weight: 330g - Materials: ABS, Silicone, Aluminum Alloy I received this last year, but I haven't used it and have been storing it at home. I received it likely in a nearly unused state, and I've only tried it on to check the operation since then. I have disinfected the entire surface with alcohol. There is no outer box or instruction manual. A charging cord is included. Instant purchase is welcome. Please refrain from purchasing if you are overly concerned about minor details. #NeckCooler