Qi Wireless Charger - Ultra Thin 0.13" Design. Works with Iphones and android Phones That support Qi. 3.3 ft USB Cable plugs into power Transformer That comes with Phone. Works through Phone Covers up to 0.31" thick. Non-Slip Surface. normal charging mode: 5 Watts (Max). fast charging Mode (Samsung Only): 10 Watts (Max). Only supports fast charging on devices using 5V2A or 9V1.67A (Best) power supplies. Only 12 Degree (C) Tempurature increase during charging, which extends Lithium Battery Life. Diameter 2.4". Black. **Lifetime Warranty Return-to-Base**