The Bullet Axial 4000 mAh Wireless Power Bank features a rechargeable lithium-polymer battery and 5W wireless charging for smartphones. It works with most plastic phone cases on. It includes a USB-to-Micro charging cable. An external Qi-standard wireless charging receiver or receiver case is required to charge a phone without wireless technology, but the device will work with smartphones without wireless technology through normal power bank capabilities. Power banks are permitted in carry-on luggage only, and at the discretion of TSA agents. Please charge power bank before initial use. Comes packaged in a FSC®-certified premium gift box.