By Wireless Charging Shell Technique which has following Environmental features as well.
Materials: Free of PVC, Free of nickel on the product surface, Free of BFR, rFR as in Nokia Substance List
Energy efficiency: Energy efficient charger
Packaging: Made of renewable materials, Containing up to 60% recycled materials, Packaging is 100 % recyclable
Recycling: 100% recoverable as materials and energy
User guide: Small printed guide, full on nokia.com