The Volter Parka from Regatta. Head on the winter commute in style. This jacket comes with a water-repellent finish, taped seems and insulation, all whilst having a great breathability rating to keep you fresh. When the temperature drops, activate the battery powered heating system for instant warmth. The heating system will charge your phone too! Please be aware there is no battery included with the jacket. Any 5 Volt battery pack with a minimum output of 2.1 Amps can be used with our heated jackets. Our battery pack specifications are: Capacity: 5000 mAh Input: Micro-USB: 5V DC 1A Output: USB-A x 2: 5V DC 2.1A Regatta Men's 'Volter' Heated Jacket in Blue Size: XL