Parallax 4000 mAh wireless power bank. The Parallax 4000 mAh wireless power bank has a rechargeable lithium polymer battery which can work as a charging pad or a regular power bank on-the-go. Output: 5V/2A. Supports wireless charging up to 1A for devices that support wireless charging. For charging the iPhone series before iPhone 8 (that has wireless technology), an external wireless charging receiver or receiver case is required. It works with most plastic phone cases on. Includes a 2-in-1 charging cable that is compatible for any device with micro port and any iOS phones. ABS plastic.